At my heaviest, I wore a 38D bra size.. Now I'm around 36B. (I lose weight fastest in the boob area, which is incredibly unfortunate.) Anyway, I was late for work, so I just grabbed the first bra I could find..
I walked into work that day lopchested. Since my breasts weren't exactly filling out the bra cups, the seat-belt had flattened out the bra cups, and it made it look like my boobs could do the wave.
That issue wasn't addressed until about mid-day when I took a trip to the restroom and noticed. I then resorted to stuffing my bra with toilet paper. In doing so, I had some intense pre-pubescent flashbacks.