It was 'Spider-Man', 'Cap' and 'Hulk', with costumes looking like the ones in that link, along with 'Batman' and 'Robin'. I guess I was expecting Adam West and Burt Ward(even if I  don't believe I knew their names at that age!), so to me, when 'Robin' tried to make small talk, ('Ya like the Hulk, huh?') it kind of 'spoiled' the moment. 

Even at age 6, I knew that Marvel and DC characters weren't 'supposed' to know each other (I'd never read what to that point had been the only Superman-Spider-Man team-up, and the second, along with the Batman-Hulk book, was at least a year away.) And the 'Robin' who spoke to me was just 'some guy in a Robin costume', so the whole thing lacked the 'magic'. 

(The following was not said afterwards, but could have been:

 'You see, son, Batman and Robin are really BUSY, so those were two of 'The Dynamic Duo's helpers...')

There was a live, in-person event with the Marvel Heroes at a mall some distance from where I lived about 15-20 years ago. Even though I was a grown-up, I decided to show up and take a look around. The guy who portrayed Cap was extremely kind and spoke with me as he was making his way to change his costume after the event was over. He was well cast in the role, I thought, and it really was kind of cool to have Captain America himself carry on a conversation with you... 

Spider-Man appeared in person at a signing event when I was a kid. Mostly I remember waiting in line and watching him pose in spidery poses for photos with the other kids. I think I went to that May D&F on my own that day. I don't remember my mother or father being there. Ah, for the days when kids roamed the earth more freely... I may still have the giveaway comic Spider-Man autographed for me...

In person events like these are so much fun. If you get to attend them. I'm still traumatized from missing a Star Trek event back when I was even younger. James Doohan was there along with a full-size mock-up of the bridge supposedly... Mom decided not to go and I was inconsolable. She still was going to go shopping at a mall that day, a rare enough occasion on its own, but I guess she didn't want to deal with the crowds she imagined would be there. I was a wreck, begging her to go to the event. She finally relented and we arrived more than 15 minutes after it ended. Doohan had left and they had the bridge almost entirely disassembled. I remember that they'd used colored glass marbles as the buttons in the black-painted cardboard instrument panels... Running my fingers over them for the brief moment I had there on the bridge...

Someday... someday, I may recover from the spiritually crushing disappointment of that terrible, terrible day... But that day will not be soon... :-)

The Official Marvel Thing is particularly hilarious bobbing around in the background, having trouble getting through doorways...