And while your friend is making tea, he throws a grenade into the basement.

Turns out there's a Palestinian family living in that basement. Actually it's their house. Your friend forced their way in, locked them in the basement, and is now throwing grenades in there now and again. He calls that "mowing the lawn", and he does it just to show them who's boss.

You thank him for the tea, and ask him if the 100 grenades you brought are enough. He's your best friend.