I was a SpongeBob-obsessed toddler who hadn't even learned to read, and I found a store flyer of my mom's that advertised SpongeBob SquarePants: Supersponge. I was like "Hey Mom, Look it's SpongeBob!!! I want it now because I'm such a spoiled brat!!!" She said "We don't have a Game Boy."
Then I saw a GBA giveaway on Hi-C juice, so I started getting lots of it despite not being particularly fond of it. Never won a Game Boy Advance, Mom bought one before we ever won any giveaway. So I played SpongeBob, struggled for hours on the first level, finally beat it (huge celebration) and had to get my mom to beat the second level for me. She claimed it was luck and never willingly played another video game.
That GBA is responsible for so much nostalgia since then and I wish I still had every game I had for it, but kids lose things (I even lost my first game, SpongeBob Supersponge and years later got another copy, so that was exciting to revisit it after so long)
Then when I visited my dad, he bought a N64 with several games, the main one that hooked me was Super Mario 64. So much that Dad became sick of Mario and tried to ban it later. But it was too late, my Mario obsession was too far along and here I am now, posting on Mario fan forums, making Mario fan art, listening to Mario music, wearing Mario clothes, desperately searching grocery stores so I can not only live and wear Mario, but also eat Mario.