[Sheldon and Leonard are working on calculations. Sheldon hums the beginning of Darlin']
Since when do you hum songs?
What are you talking about?
You were just humming.
Are you sure? Sometimes when my brain really gets moving it makes noise.
How does your brain feel about calculating the surface tension of the domain walls?
Let's see... [starts humming again] Hey! I was humming. One point for Hufflepuff.
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