Balance balls should be shoved down the users collective throats!!
Funny; I was thinking of shoving it in their other end.
I don't think that balance balls are a complete waste. I believe they
do have a place - just not on the main floor of the free-weight section.
Oftentimes, a trainee plants their jumbo beach ball down between two occupied benches, taking up an enormous amount of space while performing some kind of half-assed high wire act.
Many times, I've seen the person do something like stand on the half-ball with one leg while doing 20 lb db curls, they invariably lose their balance, fall off the damn ball, and think it's funny.
I'm waiting for the day they fall into someone doing presses with the 150's on the bench next to them.