After some security concerns after a break in, Sheldon finds himself sneaking out on his ledge.
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Penny and Leonard come outside to see Sheldon trapped by a net from the security system they installed.
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When Sheldon and Raj get a security system installed to combat intruders, it back fires on them.
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When the boys' apartment gets broken into, they call upon Wolowitz to help them install a security system.
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The Big Bang Theory Season 3 Episode 13 Quotes

Bozeman does have a comedy club called the Loony Bin. Please don't forward my mail there.

Sheldon

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

Sheldon