
Leonard is the signatory
to the Roommate Agreement...
The Big Bang Theory Season 4, Episode 9

And when we signed the Roommate Agreement,
we made a deal.
The Big Bang Theory Season 9, Episode 21

Roommate Agreement.
The Big Bang Theory Season 5, Episode 18

from full participation
in the Roommate Agreement?
The Big Bang Theory Season 5, Episode 15

He thought he was right,
but his ROOMMATE knew better."
The Big Bang Theory Season 8, Episode 9