I dislike commercials in general, but once they resort to creepy marketing my dislike turns into "leave the room and cover my eyes" hate. Like what these companies have done -
The Geico caveman. I hate these commercials! They even had a TV pilot a few years ago that, luckily, only lasted a few episodes. I think the cavemen actually remind me of several real life guys that creep me out so it makes it that much easier for me to get the heebie jeebies from the Geico cavemen.
Baby Bob, the spokesbaby for eTrade. I just don't like talking babies or animals. Cartoon are different but movies that feature real animals who have been altered to look like they talk and then have some celebrity doing their voice....shudder. Seriously, I hate it.
I saved the worst for last. These little Crocs Lite guys are gross. They run in to greet you when you get home and massage your feet and then you wear them. Sounds like something Harry Potter is made of, but JK Rowling would have toned down the creepy and turned up the awesome.