Wallpaper. When my hands are really dry (it happens, especially when it's cold out), even the thought of touching wallpaper (especially on a wall, but rolled up works too) creeps me out. Same goes for those big rolls of paper you often see in garages or near people that work with paint.
Also, really really pale female redheads. I'll be out walking with some mates, talking passionately about something that's important to me, and one of them walks into view. My brain just shuts down, and I can't even remember what I was talking about. My friends share a knowing laugh/smile, and we'll just continue where we left off when we've past her.