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// Talking about fingernails
Uston: Now, does anyone know the evolutionary purpose of fingernails?
Class:...
Uston: Well, if you were in a fight, what is the first thing you would do to the other guy?
Student: ...kick him between the legs?
Uston: No! You would poke the other guy in the eyes! The fingernails do a really great job at penetrating the eyeballs!
Class: *dumbfounded expression*
// Several minutes later
Uston: Now, does anyone know why we have evolved elbows?
Uston: Because if someone grabs you from behind, you can ELBOW them in the stomach!
Class: ................