Do you or anyone you know sit on a pilates ball at their work desk?

I've seen this on tv.  I want to see who/if anyone does this and if it helps your core and/or fitness?

I have done it.  I think it mostly helped with my posture.  I tend to slouch in a regular chair and it makes my back hurt.  When I sit on the ball I keep my back straight and have to balance on it.  I felt it in my abs at first, but after a while I didn't notice that it was doing anything.  I wanted my ball at home, so I don't have it here in the office anymore.  I plan to buy a second ball someday, because I did like sitting on it to keep my posture in check.

I wish I could do that.. if I sat on a ball at work I think everyone would think I'm crazy.

i stay a long time at the pc( at home) so sitting in one helps a lot with backache.i love  it ,have used for about 2 months now.i like to bounce on it sometimes.

I do at home in front of the computer and while watching tv.  I don't bother at work b/c it's a part-time job and 25-50% of my time is spent outside the office.  But, I say, go for it.  My chiro recommends light bouncing and it does help ease my lower back pain due to sciatica.  Be bold and GO FOR IT!