For me it was when my DH told me that my sewing room smells like a quilt store. lol I have put myself on a self-imposed fabric-buying moratorium which works fine as long as I don't go into any fabric stores, don't visit quilt shows, and don't go play online. Although, I am now only buying if I don't have the right color/pattern for an active project; I only buy what I need, and I only buy if it totally screams "BUY ME!!!!"