My old balance ball bit the dust a few months ago. I got a new one. I like to sit on the ball during teleconferences and doing other office tasks. While I can't sit on it all day - I get too stiff - it makes me feel just a teensy bit better about sitting all day. So Kitty Guy was on my lap getting rubbed and purring, then something spooked him and BAM! He was off like a shot. Not only did he take several bits of my leg with him (nice bruise) but he shot himself off the side of the ball in several. places. OK, buy a box of bike patches Blow the ball back up, covering the holes with scotch tape. Put on 6 patches. Blow the ball up a little fuller. Looked good, held the air overnight. Sat on it awhile. Got up for tea. Came back to find my new ball all flabby and shriveled.
Note to self: one should not hold cats, particularly skittish cats, while sitting on a balance ball.