Priest Enters School

Okay, listen up butter-brain. You know how priests usually say "Let us pray"? Like, before they do religious stuff? This joke takes that normal phrase and swaps "pray" with "prey". You know, like a predator hunts its 'prey'. And priests going into elementary schools... well, with the context, it's making a dark joke about priests being predators targeting kids. It's a nasty pun, perfect for someone who clearly doesn't get subtlety, like you. Yeah, that's right, you probably thought it was just about dinosaurs or something.