Sales

What is it about sales that make you want to buy things you don't need or want?
I just came back from lunch and the Pier 1 store off of Collins and 30 is closing so everything is 75% off. I almost bought three throws because they were really cheap. Luckily I was able to talk myself out of buying three of them and at the end only bought one. I was going to give the other two to my sisters but still did I really need to buy three? I bought a stool and a few other decorative items. At the end I walked out with $38 worth of stuff. Not to bad considering I usually can't contain myself around sales.