The Big Bang Theory2007

Howard Wolowitz:
[a cricket chirps] What was that?

Sheldon Cooper:
Hold on. [Looks at watch while cricket chirps] That is a snowy tree cricket.

Howard Wolowitz:
How can you tell?

Sheldon Cooper:
In 1890, Emile Dolbear determined that there was a fixed relationship between the number of chirps per minute of the snowy tree cricket and the ambient temperature; a precise relationship that is not present with ordinary field crickets.

Rajesh Koothrappali:
And how do you know what the ambient room temperature is?

Sheldon Cooper:
According to our agreement, I have unilateral control over the thermostat since the sweaty night in '06.