Deal-a-day closeout site Woot.com frequently uses irreverent ad copy when trying to sell products, sometimes going so far as to criticize the product and ask why people would want to buy it. In addition to selling closeout items and t-shirts, Woot uses clever advertising to get you to visit its website. Check out this ad that a tipster spotted in Gmail:

We are Woot.com
Our tiny profit is lost.
Haiku ads don't work.

If I wasn't already a Woot customer, I'd be tempted to click on that ad, to see what it was all about if nothing else — exactly what an ad like that should do.