I'm going to put my sister's boyfriend in a headlock.
Why would you do that?
I need to prove I am stronger than him. Its just for fun.
You might have issues with your sister's boyfriend, but putting him in a headlock is wrong. Not only would you lost the trust of your sister, but you would be physically hurt a person.
I am not going to hurt him, he is a tough guy. I just want to make him flinch slightly cause we are guys and guys do that.
I still think it is wrong, you could accidentally hurt him worse than you think. Give it another day or so to think about before going through with it.