Reading (duh), writing (theoretically), pens, flags, music (alternative, electronic, and classical mostly. K- and J-pop also welcome), languages and scripts, trains, astronomy, anime, assorted fandoms.
Every once in a while I think back to that time I had to leave work early because I was operating on maybe 2 hours of sleep and like 750mg of caffeine. Not a fun time, but I suppose I have bragging rights now?