The funniest thing you heard today?
It was in class, my instructor was telling us a story about a woman who had hyperventilated and passed out. She (my instructor) was the dental assistant with a student doctor.
Well, the funny part is that student doctor freaked out and ran away! From his patient, his dental assistant.
I laughed way too hard. The whole thing was funny, but just the way she told it was even funnier.