And even if you can't smell it anymore, no matter how much it's been cleaned, the cat still will be able to find it, and that's their way of jogging up old memories. "Oh yeah, I remember that one time I peed here. Those were some good times. I've really got to do that again sometime. ...Oh hey, I have to pee now!"
*wiiizzzzz*
I do still miss having cats around though...:\
I just really wish they didn't randomly spew bodily fluids here and there, whether it be vomit or urine. Or use carpets as toilet paper. (The bathroom is the only room in this apartment that isn't carpeted.) Or sneeze all over you.
But other than that, yeah. Fun little critters.