I was at our local Marden's today and found some back rests that had been selling at our LQS for $6, they were only $2.99. They fit nicely over your chair and hold you back in the correct position to prevent backaches.
While looking at them I was talking to another lady and a gentlemen overheard me say I'm going to use it for quilting. He said he was a quilter which got my interest. When I asked how long he said "well I know a quilter" but he said "I'm very familar with quilting terms". He asked me to "throw a term out there and I'll tell you what it means". I said "half-square-triangle" and he said I "had him with that". Very funny guy.