Two pretzels were walking down the street. One was assaulted. (say it out loud) It's kinda lame, but I teach elementary school kids, and they love jokes most adults would think are lame, including this one.
True. I remember in elementary school laughing at the stupidest jokes my teacher would tell. But, those jokes endeared him to many of his students and formed a bond that helped make his class worth putting the effort into.
What are prehistoric monsters called when they sleep? A dinosnore! What illness did everyone on the Enterprise catch? Chicken Spocks