Ooh, that is a touchy subject for me right now. Mine (all girls) have been potty trained for ages--recently my house started to smell like pee from time to time and I couldn't figure out why. Well, it's because someone keeps sneaking andpeeing on the rug!

I have a suspicions that it's the same one who has always felt compelled to pee on the bathroom rug, but I haven't actually caught her in the act...
yet...