Wanna hear a joke about measurement... never mind, it would take too long.
Did you hear the rumors about butter?
Never mind—you shouldn't spread them.
Hey, wanna hear an abortion joke? Never mind, I can't deliver it.
Wanna hear a pizza joke? Never mind, it's too cheesy.
Let me tell you a pun. Never mind, it's tearable.
Stephen Hawking walks into a b... nevermind.