1) Piano (Classical) - can play Chopin's 1st and 4th ballades and ~10 other pieces from memory (total time est. 1 hour or so), eliminates at least 99% of the population (the other 1% is playing in international competitions :skull:)
2) Geography - currently sitting at ~3,750 geography cards on Quizlet and counting (I deleted a couple hundred in the past though so probably at 4K+); regularly play random geography quizzes (flags, bird's-eye view of cities, capitals, second/third-largest cities on )
3) Diet - running probably made me crazy for some reason but I eat super plain (ex: I recently stopped using instant oatmeal packs with my breakfast in favor of making quick oats to cut out unnecessary added sugar in my diet) and basically never eat out (only when traveling and physically unable to cook) because 1) too expensive for my broke @$ and 2) extreme taste aversion/Garcia effect due to multiple food poisoning experiences in the past
A rather unusual triad, however I figured I would share since this seemed like a fun thread!