Took a minute off from reading up for TWU to take apart my bathroom sink popper-up drain stopper thing, clean the yuck out of it, and put it back. Now my roommate is trying to figure out where her receipt for her brand-new $16 drain snake went so she can return it.
I would have taken pics, but it was fast and gross and I didn't think of it until I'd put it back together. The guide here was useful because I didn't know a damn thing before I started.