I do not see this to be safe. Memorizing a seed phrase seems okay from some perspective but not alright in general. Memorizing task of this nature is more of a cram work because if you should miss one word, the whole words are mixed up which would get everything confusing for you and as such there is every possibility that you might get it difficult knowing the first word to the last word as it is sequentially. So to best be on the safe side write down your seed phrase and store them on different places best for you to quickly access them when ever you need them.

Shuffling can make the unauthorized person suffer but they might get lucky after a few several tries of entering your seed phrase in the wallet. Don't be sure that thieves can't found or access your location. They can only come in random or when you least expect it, so it is always better to be safe than sorry.

Having securely saved multiple back-up of the exact position of your seed phrase is a must so that you can login them easily but it must be kept in a much secure location which you can also remember easily. Sharing our seed phrases to our loved ones might be a good idea because unexpected things could happen to us but you should choose a family member carefully.

Hello Mr @obari, I don't think that op home boys idea is a bad idea, it's more riskier to store your seedphrase at a particular place, what if somebody by any means sees it? No were is saver than separating thing, i.e if you invest in a particular coin and the coin crash to score zero you are definitely going to lose all but if you invest in several investment's and one crash the other might remain for you.
If someone can remember his/her contact information or bank pins so I don't think that a pronunciation is hard to remember, prove me wrong, before someone should invest in Bitcoin that person should be so smart enough to remember things, been a good investor requires enough brains and smartness, is only a dull person what can easily forget things.

I do not know if this is a bad idea or not, they have a way to keep notes safer again, for them to record 10 words or 20 words and the rest of it is stored separately in different places maybe for him it is quite safe this is also the best way to store seed phrases in different places and have two different notes.

I don't do that but I save on one record and backup it in different places of course this is safe friends no one knows anyone including family, for me this is quite safe although there are some other ways that are safer but it makes me more complicated to do it.
The important thing is the backup and the place that needs to be safely kept secret.

Storing your seed phrase or private key in two separate places is not a bad idea, of which only if those locations are safe, then it is okay. But trying to store them "off-hand" (i.e by memorizing it), I think that will be the worst idea anybody could ever come up with, as our human brain is not a machine and we are likely to forget if stressed or have an accident which affected our brain. However, I have also seen others ask if can they store their seed phrase in a foam of a song? Which I think it's also another bad idea if the song is not written down and stored in a safe place.

It is always a good idea to plan an inheritance for your bitcoin to anyone you trust in your family members. That is the most important piece of advice to consider considering that no one can access the wallet if they don't have the key. You can give your wife your spare key if you trust her, but if not then you can also go the other way that many other big investors do.

I believe my wife is the right person to have a backup of the seed or privatekey of my bitcoin address, but I believe not everyone will trust their wife 100% for high value assets. But ultimately it's up to you to adapt how you inherit your bitcoins to whoever is entitled to receive them.

Could work for short-term storage but definitely not a great idea for a long-term one. It might sound safe at first it has some big security risks.
First of all let's start with that 2 words (out of 12). I'm fairly sure that if someone intercepts the first 10 words, brute-forcing the remaining 2 words would probably be doable. Especially if the thief knew that it's a 12-word seed and that the missing part are the last 2 words.
And memorising 2 words is obviously easy, but forgetting them is even easier. Most of people experienced suddenly going blank on something they remembered for a long time. Human memory is fragile and not reliable. We're not really "wired" to remember cold data, but rather to memorise experiences.

Second of all, whether or not that solution will be secure largely depends on how/where would you store the written-down phrase. Storing it on a piece of paper bears the risk of it getting: damaged (fire, flood, eaten by a dog etc), accidentally thrown away, lost (it's not hard to forget where you put it), stolen, or risk of the ink fading away over time or paper decaying etc. I wouldn't do it unless you have a home safe or bank deposit box.

For someone with a persistent memory or who lives somewhere that is not private and secure for him, this is an ideal way to save seed phrases. For those people, in my opinion, this way of isolating seed phrases can be cool.
This type of procedure should not be attempted by someone with a weak memory because they risk forgetting their seed phrase.
Even though I have a retentive memory and can recall things, I can't seem to keep two words apart, even though this method appears cool. 

This does not increase the security of their coins at all, as it would be the easiest thing in the world for a hacker, or almost anyone for that matter that knows a little bit about bitcoin, to test the 2 remaining words and eventually find the one wallet that has some bitcoin on it.

By doing this your acquaintance is making the recovery of their coins way harder while the security of their coins is not increasing significantly, making it a bad trade-off if you ask me.