Laundry :)
I almost took a new shirt back to the store the other day. I followed the care instructions and washed it in cold water. I took it out of the washing machine and put it on a hanger to dry and thought that it shrunk. I was so angry! I was going to wait for it to dry and take it right back to the store. But after it dried, I tried it on and it fit exactly the same way. LOL. It didn't shrink, I'm just not used to the smaller sizes.