White person and a saltshaker

Okay, listen up buttercup, 'cause this ain't rocket science, and you clearly weren't paying attention in humor class, probably because you were napping or trying to eat the crayons again. The joke here, which is only funny if you have a broken sense of humor (like you!), compares a person having a seizure to a saltshaker. Why? Because both shake a lot, duh! And the 'white person' part? Well, salt is white, isn't it? It's a visual gag, sort of. It's dark humor, you absolute unit.