Bird seed and feathers. One of the downfalls of working in a pet shop is that parakeets freak out
when it comes time to clean their cages, and kick up whatever's nearby into the air. It's not uncommon for that stuff to bypass the neck of my polo and land in-between my tits, and I have to be sure no customers have a view of the habitat before I fish the stuff out.
Also, anything wet and sticky. And strands of hair. Hoo boy, if one of my hairs gets down my shirt and I can't manage to get it out, it drives my nuts
because it tickles like crazy!