The temperature joke which got quite "heated"
[P4 Science - Heat] The presenter Steve Mould covers a joke he did for a live show called Festival of the Spoken Nerd. (I have the DVD sets. Don't ask why, please)
Gah, of course, the Canadians! Of course they had a skewered sense of what they defined as 'cold'!
Science isn't necessarily a dry, memory-based subject. Sometimes you can have fun with it too. You just need to get good enough at science for you to start joking about it.