It really depends on the depth of his feeling as to whether he may remember it or not. Gosh, I remember when I was about 2, watching Bugs Bunny. He’d whip this black hole out of his pocket, throw it on the ground, then he could jump in the hole. I asked my mom to make me one. She cut out a circle from a piece of black cloth. I hesitated a loooong time before jumping on that home made black hole because I wasn’t sure what was going to happen, or where I was going to end up. But I finally gathered my courage up and jumped. I remember the feeling of relief and disappointment that nothing happened. I remember it.
My dad remembers as a child going to the old Mobile station with his dad. Their logo was the flying horse. The attendant came out and asked my dad if he wanted a horse. My dad said yes, and got soooo excited thinking this guy was going to give him a horse!
He never forgot his disappointment when the guy handed him a little plastic horse.
Kids remember disappointments. Not all of them, not every incident, but they remember. You can’t dismiss anyone’s feelings because “Well, they won’t remember it.”
I blame the mom because according to the story she told the kid he was going to meet Iron Man.
I mean, how would you feel if your SO said, “We’re going to Jamaica!” Had you convinced you were going to Jamaica. Then took you to a movie about Jamaica.