Personally, I was more of a Soundwave guy, but if I had to pick a favorite toy it would be the mountain of Lego that I have tucked away in a closet. Lego easily trumps all the other toys I enjoyed as a child, from Snake Eyes to Skeletor, and it's a little more practical, since you could just bury me in it.
What were your favorite toys as a child? Do you still enjoy or collect them as an adult? Are there any that will follow you to your grave?