[After the guys hear a cricket and Sheldon says its a snowy tree cricket based on the chirps]
Howard: I am willing to bet anything, that's an ordinary field cricket.
Sheldon: I can't take your money.
Howard: What's the matter? You chicken?
Sheldon: I've always found that an inappropriate slur. Chickens are not, by nature, at all timid. In fact, when I was young, my neighbor's chicken got loose and chased me up the big elm tree in front of our house.
Raj: Chickens can't climb trees.
Sheldon: Thank God.

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