Yawns.

Yawning is so contagious. No one can figure out exactly why, it just... is.

So, funny story: today I spent the whole day in the library (that's not the funny part) and whenever I get to the point of complete exhaustion my mind either goes completely crazy, or.....blank. Today I chose crazy. I learned that I can be sitting ANYWHERE in the library and if I just stretch out my arms and yawn really loud...I can make at least 3 other people yawn too. Doing this to poor stressed out college students during midterms is kind of mean I guess, but sometimes I just have to do something to keep my eyes open. (Even if it may or may not put everyone else around me to sleep!) Try it sometime, it's amazing how contagious yawns are.

I bet you yawned once while reading this.