The ending of a joke is called the punchline.
A joke with a very shady punchline. A good example is the fact that you categorized this in "Human and Animal Interaction".
This is a joke, right? Yes, Gluten comes from wheat. Lard is pure animal fat. No joke.
The word "joke" comes from the Latin word jocus, meaning the same thing.
This is a joke about cross breeding a cow with a bee. The end of the joke is about what the animal would say, which would be "buzz, moo".
prankNoun: A practical joke or mischievous act.
Because nobody ever walks out on them HAHA math joke (:
Actually, the band is called Cool Joke. The song is called UNDO. But that's okay. Cool Joke performs the song UNDO in FullMetal Alchemist.
Chalokti.
Yes. An inside joke is a joke that only certain people understand. They are more personal, that's why.
Yes. Sometimes the deceased leaves the bulk of their estate to an animal (like a favorite dog) which the surviving family regards as a joke.
Not sure what you mean by "scientifically funny", but a joke can be both scientific, i.e. about some science topic (and perhaps even scientifically accurate), and funny.