Pubes, skid marks and pee stains on the toilet.... places where you have to take your shoes off, but then your feet are blacker than black because the floors are so dirty. lol. when someone doesn't use toilet spray after they do a poo in the bathroom. a billion toys lying about so you have to step over things constantly, (i know kids have to play, but a couple of friends of mine has so MANY toys it boggles the mind. and most of it is leggo... so if you step on it it hurts.) dry snotty noses on kids. (how hard is a tissue sometimes!!) snot marks on couches. yuckkkk.