Video games, generally speaking, are finished products. Sure, they might get updated nowadays with patches and updates, but they're creations made by other people that we then purchase and experience for ourselves, unless there are customization or creation tools within individual games.
However, one platform doesn't play by the rules. PC players have, for decades, been able to crack games wide open and mess around with the innards, doing all kinds of weird stuff to their favorite games in the form of mods. Sometimes mods provide alternate content, sometimes they attempt to fix bugs, and other times they're just the community being as weird as possible. The following list is an ode to the latter group, the people who take time and effort just to make random people crack a smile.