Many people find rats disgusting. They were the main reason for the spread of plague, they scavenge, and they have freakishly long tails.
I personally don't mind the rodents, I had man hamsters growing up, but I will admit there's something different about rats. Unless its Splinter and in which case Splinter is KING!
But a Del Ray School's vending machine saw this unwanted guest running through some snacks just the other day: