What did one _____ say to the other _____? jokes
What did one dolphin say to the other dolphin?
You did that on porpoise.
In these two-line jokes, two things that don't usually speak (animals or things) talk to each other.
These jokes depend on the second line of the joke being a pun (a funny use of a word that has two meanings or of different words that sound the same but mean different things).
For example, 'porpoise' and 'purpose' sound similar. And saying 'You did that on purpose' is a fixed phrase we can use to blame someone for something they did wrong.
What did one elevator say to the other elevator?
I think I'm coming down with something!
(A lift can 'come down with something' - usually people from one floor of a building to another - but 'come down with something' also means 'feel sick or ill'.)
What did one hurricane say to the other hurricane?
I've got my eye on you.
(The centre of a hurricane is called 'the eye' but to 'have your eye on someone' means that you fancy them or like them in a romantic or sexual way.)