Watching the hourly movements of my (very small) investment portfolio. "Hey it just went up $4!" I don't plan on touching it for years so I don't know why I do it. Just something cool about watching my balance change by the minute, however small those changes are. I also like screening for stocks of companies I'll never buy and making fake portfolios in Google finance.
I like cleaning the kitchen. It's pretty small, so its manageable and not intimidating. I just put on some headphones and go to work. Doesn't take very long to have a spotless kitchen with everything put away in the right place, knives sharpened (I love sharpening knives), clean microwave, etc. I hate cleaning the rest of the apartment though.