I also like the one with the Gecko in the NASCAR shop and every time he tries to say something, a loud noise drowns him out from giving out...the secret to Casey Mears's barbeque sauce. Of course, I've worked with Casey fairly often, so I like him anyway...
And I like the Bigfoot one where they put his hand in the water and make him wet his bed.
I like the pig because it makes me remember a good friend who has passed away. When I was younger I was traveling with her an one of her friends to a horse show and she started saying "I gotta wee, really you have to stop so I can wee". This went on for a bit and until we were in the middle of no where and we stopped and she got out and went "WEEEEEEEEEEEEEEEEE!!!!!!!!!!!!!"
Love the "original" pig commercial (they made a 2nd & maybe even a 3rd one that weren't as funny, & pretty much all of the others. My hands-down favorite though is one of their earlier ones - the one with the two squirrels in the road that cause an accident & then high-five each other.