I remember going from the 2600 to the 5200 and thinking, "Man, these carts are big! That must be so they can do all this advanced graphics and stuff."
Then I got an Atari 400 and some of the boxed games. Of course, the boxes for those games were way larger than the 2600/5200 boxes. So I'm thinking, "Wow, these cartridges are going to be huge!!" Then I get it home, open the box, and there's this tiny little cartridge in there.
Me, at the time: