They add to revenue per square foot, but they also obstruct the aisles, triggering the dreaded "butt-brush" phenomenon: Female shoppers don't like to be touched by passersby.

FORBES: Merchant Princes

"I can honestly say I didn't see it but Joe Simpson's nose looks like there was a head-butt, " he said.

BBC: 'Head-butt' compounds Quins woes

It wasn't too long ago that the first jogger's girth made him the butt of late-night TV jokes, like when comedian Arsenio Hall marked the anniversary of the Big Mac.

CNN: A Trimmer President Clinton