It wasn't an official sign-up SHEET.
He printed it...
The Big Bang Theory Season 2, Episode 3
She is disheveled, and Raj
is dressed only in a SHEET.
The Big Bang Theory Season 5, Episode 1
PVC comes here. Maybe a little
corrugated SHEET metal as a radiator here.
The Big Bang Theory Season 1, Episode 2
It's listed as a current asset
on this balance SHEET,
Breaking Bad Season 2, Episode 10
...and Dr. Winkle just ripped
the sign-up SHEET off the wall.
The Big Bang Theory Season 2, Episode 3