So here it how it works:
1)You create your own bitcoin wallet and deposit all your money there;
2) Then you friend is asking to send it to him, cause he has a great business idea;
3)You transfer all your bitcoins to your friend;
4) Your friend does not receive it, because misspelled something in wallet Nr
5) You are in deep sh..t cause you sent money to unknown person and you cannot recover it back.