My High school calc class consists entirely of four guys, three of which have known each other quite closely since 6th grade. Memes are abound.
Reviewing homework one day...
J: Yeah, I didn't get that derivative because... I just got scared and ran.
Me: I actually got that one. All you have to do is calm down and apply the chain rule.
G: Note the first part of that order.
"Dude, just calm down and apply the chain rule." is now a meme between us.
After an exceedingly frustrating lesson...
*G grimaces, balls up his fists, and begins pounding on his textbook.* [This kind of outburst is not exactly unusual between the four of us]
*Everyone turns their heads toward him nonchalantly*
G:*moans* It can hurt me
, but I can't hurt it