What sayings/phrases/etc. do you use a lot that you have no good reason for having picked up so thoroughly. Not really music/movie references, because that goes with fandom. ANd not really stuff you pick up from friends because it seems things get passed really easily in friend groups.
I was just thinking about it because I realize I often say "that bites the wax tadpole" and really the only exposure I have to the phrase is learning it was the way coca cola was accidentally translating in an asian country. It just caught my eye and entered my usage. There's no real compelling reason for it.