What Creeps You Out?

I once knew a woman who had to dress her baby very carefully.  Not in the o is my precious bundle dressed in her best coordinated Baby Gap ensemble for maximum cuteness sort of way, but more in a can I stand to touch my own newborn because of the fabric cloaking her body sort of way.  She had an aversion to velvet, you see.

I know another lady who hates cats.  She hates them not for the allergies they bring in their feline wake, nor for the hair they deposit everywhere they go.  She just. can't. stand. them.  The idea of touching the long, lanky muscles just barely cloaked by skin and fur makes her cringe. 

I know two men who can't even look at a child with a danglingly loose tooth.  The only answer for these men is to avert their revolted eyes.

I, myself, am very nearly horrified by ketchup.  Though for the most part I try not to, when I think of putting some of this - to me - noxious substance in my mouth, I feel a speckle of tiny pricks spreading their horror-struck way across the back of my neck, culminating in an animalistic shake of my upper torso.  I'd rather eat bugs, frankly.  And I'm only exaggerating a little when I say this.

What perhaps irrational thing creeps you out?