Cobwebs. I hate them. Sticky little suckers, almost invisible if the light isn't hitting them, and entirely too difficult to get rid of. You might try and brush it out of your hair, off your clothes, get that last string off your arm, only to discover just a few minutes later that there's yet another piece sticking to you, or that a line of it had clung to the back of your shirt where you couldn't see it but everyone else behind you could.
Just like sin.