Alright, here's mine.
So about a decade or so back, maybe a bit more, my dad got us a GCN, that my siblings and I adored to death. We had a cousin who stayed on the 5th floor of our block, so he'd occasionally come up to our home up on the 13th, and us to his home on the 5th, since he had a GCN as well.
Basically some years after, my brother, cousin and I were playing Digimon World 4 that we had gotten on the GCN. We did loads of stupid shit then, with our childish thoughts what not. Back then we had this thing where each person took one of the four digimon, my cousin Agumon, my brother Dorumon, and me Veemon, this will be a little relevant later.
The very first of the funny things that happened being a weapon in the inventory of our cousin's Agumon, and we had the bright idea that the "Break" command was to break it literally into pieces that we could then share, and not that it would destroy the item. You can pretty much guess what happened.
The next one was us constantly going to the digivolve booth and spam digivolving to the other digimon, when we started to just run around and get slightly annoyed that we cant switch back to our own characters yet to continue the game.
Then came along what I'd call the apex of the shenanigans: I accidentally overwritten my cousin's Agumon save, which mind you by that time we were at level 40. He got mad at me for a long while until my brother offered to let him have his Dorumon save.
Other shenanigans included bastardizing the boss digimon names such as Apocalymon to Apple Curry Mon, and calling Malovamdemon "That guy with boobs on his shoulders that can open and shoot black balls".
Good memories....