Amy Farrah Fowler comes to dinner with the gang and starts talking about feminine hygiene. The guys are grossed out meaning she was obviously causing an external cost onto them.

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Parking Spot Externalities

Howard and Sheldon feud over a parking spot.

WiFi Password

Sheldon changes the password on the WiFi.

Penny's Negative Externalities

A new part of the Roommate Agreement includes payments for all of Penny's bad habits.

Dinner Talk Externalities

Amy talks about tampons which upsets the guys.

Pizza Free Rider

Penny consumes a pizza without paying because Leonard does not enforce property rights.

Arguments as a Negative Externality

Leonard and Penny are in a huge fight.

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