Wow Lat, fucking super high five; I was going to post the exact same thing the moment I read the title. My ex used to think it was the weirdest thing in the world that I put on a playlist specifically for taking showers, and I do it every single time; no exceptions. Usually to high-energy music as well, but every now and then if I'm taking a hangover shower, I'll put on some FNDMNTL, Chroma Key, or ANALOGMAN; but most of the time it's Devin Townsend, Gorillaz, BTBAM, Opeth, or Parkway Drive. So fuck yeah to the shower playlists. That's really all I've got right now but I'm sure everything I do is weird in some way.
Oh, one minor thing. Every time I get a glass/cup to drink out of, even if I know it's just been washed and put way, I'll blow inside of it to get any dust or other debris out of it; if I have any doubt that there's still dust in it, I'll wash it out before pouring whatever I'm drinking in (even if it's more water).