Web design fail 001

I encountered this message on a website today (emphasis mine):

Hi! For some reason we can't display an ad here, probably because of an ad blocker. If this ad is not displayed our design gets screwed up. We have full respect if you want to run an ad blocker but we would appreciate if you add us to your white list or consider donating via Flattr or Paypal. The free web is dependent on ads to continue to be free. Thank you, and we hope you find a great alternative!

If your entire design crucially depends on an externally hosted advert being correctly displayed in order to not get screwed up, you are doing it wrong.