i am serious . How will it be entegrated everyday life?

... or if you really want to do it on your own, there's ripple.

but keep in mind, that using the methods mentioned is like having a middle man. you get your btc in seconds, but someone else is holding them for you. 

momentary?

i wanted him to troll some more.  it is actually an opportunity to advertise the projects you like by talking about it with the trolls.  

It's not for everyday life.
No meaning and no need.

No, he would need to assume on 0 confirmation that you are not cheat. Exactly like you giving him paper money, that they aren't fake

A normal merchant uses a service like Bitpay or BitKassa (Dutch company) to handle Bitcoin payments. These companies promise that the merchant gets their money, even if a double spend happens or the price crashes. Merchant aren't at risk, so accepting a 0 confirmation transaction isn't a problem at all.

Also paid with bitcoin for beer, cocktails and food a few times. Therefor a slightly off-topic question to those who did as well:

How were tips handled? Often the price is coded into the QR code and - depending on your wallet - can't be changed. Last time I used bitcoin the waiter told me that although they accept BTC, tips in FIAT would be welcome.

Do payment processors have a solution for that?