#2248: New Year's Eve
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Transcript
[Cueball, with his hands raised, is talking to Megan and White Hat.]
Cueball: Tomorrow is New Year's Eve, and you know what that means:
Cueball: It's the one day of the year when you can convert between ages and birth years by subtraction without worrying about off-by-one errors!
Cueball: Also there are probably parties.
(Sourced from explainxkcd.com)
Title text:"Off-by-one errors" isn't the easiest theme to build a party around, but I've seen worse.