I'll let you ponder over that one
You say this when you're too lazy to fix your mistake, so you just let everyone wonder if you were being smart or just high.
'I'll let you ponder over that one' after I told my friend I could speak fluent squirrel.
'I'll let you ponder over that one' when I said my calculator had a soul.
'I'll let you ponder over that one' after I told my teacher I was a wizard in training.