After some security concerns after a break in, Sheldon finds himself sneaking out on his ledge.
Penny and Leonard come outside to see Sheldon trapped by a net from the security system they installed.
When Sheldon and Raj get a security system installed to combat intruders, it back fires on them.
When the boys' apartment gets broken into, they call upon Wolowitz to help them install a security system.

The Big Bang Theory Season 3 Episode 13 Quotes

I'm not crazy; my mother had me tested.


Sheldon: You know, the more I think about it, the "mobster sauce" couldn't possibly contain chunks of mobster.
Leonard: And why is that?
Sheldon: It was listed under "Seafood."
Leonard: Maybe they were mobsters who "slept with the fishes."