Aside from a Tom & Jerry jack in the box, the oldest toys I can remember are the Ding-A-Ling Robots. They seemed to be all over the place in the early 70's. They ranged from looking pretty cool to being cartoony and lame. I mean, who the hell wanted a robot shoeshine boy? Don't even get me started on "Gofer". I never had any of the playsets or battery packs, but I did have King Ding and that was pretty much the luxury town car of robots.
Sort of a low tech variant of the Snoopy Sno-Cone Machine, Ice Bird was essentially a cheese grater with (As they would say on Portlandia) a bird on it. It was good for a few frozen treats and bloody cuts before you ran out of flavor syrup and tossed it in the corner where it would stare back at you with it's cold dead eyes.
In the mid 70's the biggest hero of young boys was a guy who was partially successful at jumping over stuff, but mostly seemed to wind up landing on the ground and hurting himself badly. Even in this commercial, after several impressive jumps they end off with him falling off the bike and rolling around. It was a fun toy that would've been cooler if you could've heard the bones break.
Post Star Wars, Starbird was a spaceship that made different noises of rising/lowering depending on which way you pointed it. The front and wing sections also detached into separate ships. It was the perfect thing for defending the universe or terrorizing the family cat.