Oddities of a public restroom

So, I just got back from using the restroom on the first floor of the Physics building. I went to sit down on the toilet and look at the floor. What do I see? Fingernail clippings. Lots of them. A few of them were big. When I say big, I mean it looks like someone clipped the talons off of an eagle! So, after brief reflection on this incident, I'm left with the following questions...

Who the fuck clips their fingernails in a public restroom stall?
And why don't you have the common courtesy to clean that shit up when you are done?
Anyone else spot some fun items in public restrooms?