An ad promoting 2011's Howl-O-Scream at Busch Gardens was aired on TV a little earlier the same year.
The commercial features a cutesy/creepy song in the background as the camera pans over CG figures and gardens, intercut with people visiting the attraction, clearly scared. But it's not over yet. At exactly the last second, a zombie woman pops out of a patch of roses howling before abruptly cutting off.
NOTE: The following video contains a screamer.