The smell of most cleaning solutions, even the "harsher" ones.
Having fuzz/lint picked off of any velcro I may have on (pockets/etc) gives me butterflies in my stomach, unlike anything else.
Bright red dyed hair. Not really that weird, but it's to such a degree that I'll stare at any girl who's dyed her hair bright red, even if I'd find her unattractive otherwise. Put a pair of boots on her and it's over for me.
Getting buried under a pile of hot laundry right out of the dryer. Although I bet more people would like it if they'd give it a shot.