I punched my music teacher in the face...
I guess I am on a bit of a roll, so here is another Zapp B/Trump Meme mashup. As before this is a Trump quote on an image of Zapp.
The joke here is that Trump must have poor impulse control, because who punches someone just for not knowing something? the correct response in that situation would be to quit the class.
This is funny because pointing out weaknesses in people is funny.