What's the opposite of eye candy?

What's the opposite of eye candy?

I heard someone say, "Eye broccoli," but that's not very accurate to those of us who love broccoli. Any other ideas?

Eyesore? Affront to all that is holy? Mirror-cracker?

"Eye Candy" is most often applied to people. In that case, the opposite is "Double Bagger".

Paraphrasing the Urban Dictionary entry (vulgar) -- which the term predates by up to 60 years:

Double Bagger:
A (person) so ugly that (making love to) (him or her) is only possibly(sic) with the use of two bags: One over (his/her) head, and a second bag over your own head in case (his/her) bag falls off.

In the general case, "Eyesore" is common, as idunno answered.
But I prefer: "A blight for sore eyes" (^_^)