Personally, I thought the Gmork from the Neverending Story was creepy as hell:
As far as the Grimace goes, he was one of the Ronald McDonald friends back in the 80's. Y'know, when they still 'Liked To See Us Smile.' As far as I can tell, the Friends have been mostly phased out for some kind of wretched urban-pop theme. Anyways, The Grimace:
