Pitcher's mounds. When you watch a baseball game on TV, they often super-impose an ad on the damned dirt. Also graphics at the bottom of the screen will often have an ad box.
Every available inch of visible space must be covered in an ad. It makes me resent those brands.
In particular, I stew over insurance companies spending millions on celebrities in commercials and prime time slots. That's money that could have gone to pay claims that were denied, or lowered their ridiculous premiums.
And I'll never understand people who purchase expensive t-shirts or caps with some corporate brand's logo splashed across it. They are paying more to be a human billboard. Are we supposed to be impressed with their taste in something millions of others have bought?