Someone left it while I slept.

That's how I must've done it!

...while you slept.

while they slept.

You must've dropped it while running.

You must've done it wrong.

I must've done somethin' good.

you must've slept with Sandi's mom.

Well, while you slept,

And while he slept,

while his roommate slept.

Must've done something right.

It wasn't Mr. Kapoor who slept in discomfort while I slept well

Late that night while I slept?

I shouldn't wonder. Yeah, must've done.

I have a prosthetic arm! I must've done it!