What's worse than having ants in your pants?
Uncles.
What's worse than having ants in your pants?
Uncles.
Listen up, genius. You see, the joke is a play on word. "Ants in your pants" is bad, right? But "uncles" sounds like "uncles" which implies unwanted sexual advances on children. It's dark because it hints at a very uncomfortable and disturbing topic. Get it now, or do I need to spell it out with alphabet cereal?