The limits of optical illusions.

It's that dress that gives women an hourglass-figure look... except when it doesn't.

And as long as I'm debasing myself by reading the Daily Mail: Chaz Bono is having trouble rehearsing for "Dancing with the Stars" "because he lacks rhythm." I'm sure they can figure out a few optical illusions — lighting, costumes, editing, spiffy partner — to keep the current attention-getter from early elimination.