Season 3, Episode 23: "The Keys"

...doesn't entitle you to break in.

That's the reason you took Kramer's keys.

You're not even supposed to have Elaine's keys.

You're supposed to give them to her so she can give them to me.

So technically, those are my keys.

If you'd never taken your keys from Kramer...

...he never would have given his to me.

In which case, I wouldn't have had to take mine back from her.