Well, the other day there was an autoplaying ad at the top of most pages.
No amount of dancing baby is more annoying than that.
Edited to add:
Who would have guessed!
The same god dammed video just popped while I was writing this! It consumes half the page, so it makes everything else jump up and down. That is in NO WAY irritating at all!
And before and editor jumps in and points to the contact links for errors or problems. I already did. On Wednesday. Still waiting for an acknowledgement.