[Skullmeat]

See Firstly: go to his/her house.
Then: Ask him/her to give you the wifi password.
After That: If he/she gave you the password then completed but If not, Start kicking and hitting them until he/she give you the password.
Finally: Go and Enjoy

Ahh like Ender said wifiphisher is best choice.

Please tell me you are trolling...

Actually wifiphisher is a best choice because you can make a fake wifi like a keylogger.
And that above isn't troll, you can try it yourself if it didn't worked, you made a mistake somewhere so be careful with the first way .

Ask to use their wifi? I think that would result in some follow up questions OP wouldn't want to answer. Second, use your head @Mr.Kurd physically attacking someone like that is assault, and will likely end in jail time. He wants to do this quietly.