Leonard Hofstadter: When did we get a wall safe?
Sheldon Cooper: When there was no more room in the floor safe.
Leonard Hofstadter: When did we get a floor safe?
Sheldon Cooper: When we got the security camera!
Leonard Hofstadter: There's a security camera?
Sheldon Cooper: Aquaman, protecting your home since 2012.
Penny Hofstadter: Oh my God, we've done things on that couch.
Sheldon Cooper: Yeah, you don't have to tell me.