Monroe’s Ceiling Fan Is Disgusting [PIC]

For the last couple years of living in my apartment, I don't think I have ever turned the ceiling fan off in my room. It's nice and quiet and I never think about. Well this morning, I was a bit cold and turned off the fan. After the fan blades came to a stop I happened to look up at them.

They are disgusting! I never thought a moving fan blade could attract dust. Apparently, I was wrong. With that said, what's the dirtiest thing that you've stumbled across in your place?