Nerd Joke

I made a good nerd joke the other day, but no one was around to hear it. (A nerd joke is something that only a small group of nerds might find funny, but no one else will get, and when explained to them, will still not find funny). So I'll just repeat it here.

I was watching a show about how they make sherbet. (Already sort of nerdy). They noted after the stuff was packaged, it was stored in -40 degree freezers to harden it.

Me (in a knowing, sarcastic manner): "Is that Celsius or Fahrenheit?" (Little snicker.)