We've been studying figurative language--metaphors and similes, specifically--in class, and today one of my students brought me the following simile:
Friendship is like peeing your pants: everyone can see it but only you can feel the true warmth.
Ha! Awesome, right? Not only for the humor factor of the simile, I mean, but because she saw this online, recognized it as a simile, AND thought to bring it in to class to share! Yay!