I've used a few really cheezy ones when really smashed just for a laugh.
If I'm serious about someone I'll put the spadework in, if not then I'll trot out the cliches.
"Do you know why it's so dark outside? Because all the stars are in your eyes."
"Be unique and different - say YES!!"
"How was heaven when you left it?"
Told you they were cheezy. One of them actually worked believe it or not.