Professor Proved He Had a Big Mouth
Some professors will go above and beyond to find a metaphor or real life example that illustrates their theories. Take this guy, for example. He was teaching his students all about theorems and proofs.
The example on the chalkboard said “I have a big mouth.” To prove it, he tried to stick his entire fist in his mouth and it worked. He also undoubtedly left a lot of his students speechless.