When I would visit my grandmother as a kid, my parents wouldn't let me bring a game console with me, and she lived in the middle of nowhere so I would get bored pretty easily.

One summer, I had brought a book on how to make different paper airplanes. My grandmother had this huge crate of dot matrix printer paper [1] that I was given freedom to use to my heart's content.

I made hundreds of planes, of varying quality. I even did quasi-scientific tests to see which ones would fly farther, and I used a rubber band extended to the same length each time to try and ensure I was applying roughly the same amount of force in each launch.

I look back at that time pretty fondly. It was the only time in my life that I actually had fun visiting my grandmother's house.

[1] Even at the time this was somewhat outdated; she had a normal inkjet printer at the time so the paper was basically useless as printer paper.