The punchlines were too long.
The Circuits! (this is a joke i made up when i was like 10, i don't think it ever caught on)
Clickbait
Do you know the problem with UDP jokes?
Zzzzzzzzz, wait, I fell asleep at the punchline.
The punchline is too long.
The punch lines were too long in Jonestown.
The punch line.