I do it all the time! Sometimes I have an excuse though...baby shower or birthday and need a quick quilt, so I put aside what I'm doing and start another project. I have many projects bagged up so I can grab and start one quickly. Every so often, I will make myself finish up an older project. Right now I've got a bunch of tops I recently finished that were in the works for awhile and now just waiting to be quilted. I had a 3 day weekend and planned on quilting every day...but I didn't feel well and only quilted for a few hours. Life happens!