Knowing that I'm fat, but then I see a picture of myself at a friends birthday party and thinking, "Holy &*$! I'm THAT big? THAT'S what I look like??" And then being totally depressed because you felt so cute when you got dressed for the party.

Wearing a sports bra instead of an underwire around the house for comfort and to minimize sagging...then catching sight of yourself in the mirror and without the boobs to stick out a little, it just looks like a slab o' flab on your torso.