They just gross me out! Something about them really turns my stomach. I know it's strange. I don't normally even think about stuff I see on ads, which I always mute. I think I have that distaste because I wrote advertising and marketing copy (in addition to speeches) for many years at the job I left last fall to return to school. I have strong feelings about advertising making a pleasant association with viewers/readers/buyers. Obviously some people make a pleasant association with those cave guys or they wouldn't keep using them and making new ads. I'm just not one of them. I think I see them as insulting and degrading to both humans and to the great apes, both of which are species I love in their pure forms.