Now that we’re just about ready to enjoy The Avengers, Captain America’s shield doesn’t seem like much of an easter egg. But when it first appeared on Tony Stark’s work bench in the original Iron Man, it was mind-blowing for fans. Not only was that the closest we got to a shared superhero universe up until then, but a Captain America movie wasn’t even in the cards at that point. 

Then, when the shield appeared again in Iron Man 2, it was much more obvious, and we already knew that Chris Evans would be playing the Star Spangled Avenger the following summer. But it was still a very cool geek moment nonetheless.