wad it up and throw it in the trash
OH NO! Please don't. Read all the posts about giving things to animal shelters. But the better place, to me, would be to give it to St. Vinney's or Good Will. I have picked up at least 4 quilt tops at those places and finished them and then re-donated them. (On one I had to take out whole rows, but the sewing was so bad that it wasn't hard to do that.) That way at least your work that you have already put into it will be of some use to someone.