Why did the researchers want all the shore birds high on marijuana?
They wanted to leave no tern unstoned.
Alright listen up buttercup, this one is choice because it's a play on words! "Tern" is a type of bird, and "stoned" means high. So the joke is saying they wanted to get all the terns (birds) high, leaving no "tern unstoned". It is a pun. You probably think a pun is some sort of asian soup. Haha! I bet you have rocks for brains.