The mathematical formula which explains why music you hated 20 years ago sounds so much better than what passes for music today.
Cultural mathematicians have formulated the nostalgiarithm to explain why Holly had to pull over after hearing T'Pau on the radio. It's: (Friends Reunited x divorce) / (Autotune + viognier).
The unconscious assimilation of camp mannerisms as a consequence of spending time with gay friends or engaging with gay culture.
"Brett spent the whole weekend watching re-runs of Will and Grace and suddenly he's obsessed with telling me which celebrities are in the closet."
"Sounds like a case of Stockhomo Syndrome."