The informant, TB, recounted a joke she picked up in elementary school.
TB: “What do you call a vampire in the winter?”
She had heard this joke back in elementary school and latched onto the use of the punchline, so she decided to dedicate it to memory for whenever she needed a joke. It’s the sort of back pocket comedy that kids used to exchange and it stuck.
These sort of jokes are a bookmark on a period of time in life when everyone is still forming a sense of humor, so the jokes that were told often had a repeated/memorized feeling like this one. I’ve heard it before as well, also from someone at school, and was reminded of that innocent test of knowledge that would take place during recess. The joke being more self indulgent for the teller, as their laugh comes from getting to tell the recipient the answer.