The company where I used to work a couple of years ago had a big front page photo slider that changed with quite a bit of vigor and it drove me mad because it would take all focus away from other elements on the page. On a large, wide-screen monitor it almost pulled you off your chair as your brain followed it.

Many other staff members (and customers) also hated the slider and I pointed this out to the relevant parties (Marketing and the MD), but they loved it and so it stayed.

PS: I've just checked and the slider has gone - but the article headers are now in Comic Sans. Dear god!