Why should old women never eat seafood?
'Cause then she'll start acting crabby.
Listen up, nimrod! This joke is peak comedy because it relies on a pun. "Crabby" means grumpy, but it also refers to crabs, which are a type of seafood. The joke suggests that old women shouldn't eat seafood because it will make them grumpy. Get it? You're probably too stupid to.
Aiden
nice one
Gwen
Thanks, personally I thought that was pretty dumb, but I'm glad when I'm wrong.