This is a kind of 'fill-in-the-blank' question. For me, the answer would have to be '... in childhood with my first tin robot toy.' So you can easily imagine the overpowering excitement and delight I felt when I ran across the 'Robot Island' website.
Jay Brotter, who owns and operates Robot Island, must have had a simliar experience because he put a tremendous amount of time and effort into creating a fantastic site offering vintage toy robots. Of course he has Robbie the Robot - what self-respecting toy robot site would be without Robbie. But, he also has Mercury Man, Electra, Giant Lilliput, Go Float, Gort, Iron Man, Mr. Atomic, Proton Man, and a host of others I've never seen before. As Robosapien V2 says, "Gimme! Gimme! Gimme!"
Robot Island is more than just a robot collectables online store, it's a treasurehouse of history, stories, articles, and photos. Robot Island has an amazing robot archive section as well where Jay keeps listings for robots that have passed through Robot Island before, and may visit again in the future. And there's a great photo gallery section where members can upload photos of their robot collections.
Of course, if you happen to be looking for a vintage toy robot to add to your collection, or as a Christmas gift, Jay has lots of items that will please and delight you. Now, if I can only manage to drop a hint to my wife about that Tremendous Mike tin robot....