Lesson 521: Never put regular all-purpose thread in your serger. Very bad things will happen. You will have to rethread the machine. You will have to read the book that came with the machine. You may have to watch the very poorly produced DVD that comes with machine that is harder to understand than the book. You will rage. You will conquer. Your cat will help. You will rethread the machine and wonder how many things you can do in the same color of thread so you don’t ever have to rethread again.