Big Bang Theory Quote
Leonard: (Walking by Sheldon's office door) My God, what is that smell?
(Knocks on the door-Sheldon emerges wearing a gasmask)
Sheldon: Yes?
Leonard: What are you doing in there?
Sheldon: I'm making hydrogen sulfide and ammonia gas. Just a little experiment in pest control.
Raj: (Raj emerges from the office) That's not gonna work, dude, I grew up in India: an entire sub-continent where cows walk in the street and nobody has ever had a solid bowel movement.
Sheldon: Well, we'll just see how long you can hold out.
Raj: Well, we'll just see how you noxious gas fares against my cinnamon-apple scented aromatherapy candles.
(Retreats into the office. Sheldon turns to Leonard and shakes his head)
Leonard: Didn't you say you're making hydrogen sulfide gas?
Sheldon: Yes.
Leonard: Isn't that flammable?
Sheldon: Highly.
(Leonard looks at him with raised eyebrows)
Sheldon: Oh, dear.
Raj: (There is a flash and a bang from inside the office. Leonard and Sheldon step back quickly. Raj emerges blackened and dishevelled with a parakeet in a cage) This is not over.
Quote from S04E04 - The Hot Troll Deviation