In first grade? There was this little Hot Wheels style car that could transform into a robot man. I loved that little thing. Top favorite toy in the classroom.
Took it home one day. I was too afraid to play with it, so I just stuffed it into the box with the other toy cars. I was also too afraid to return it after a while. I still have it, and the guilt over taking this thing lives rent-free in my head.
This. There was something vaguely ritualistic about getting out a box to open all the little plastic packages into, then spreading out the instructions and getting to work.
For a while there the instructions sometimes even had little comics at the bottom of the pages, and so you could read the comic and then go back and actually build the thing.