I used to vandalize Wikipedia. I'm probably part of the reason you have to be vetted to do it anymore lol. :p
Nothing malicious, just goofy stuff in random articles when I was bored. My edits would stay up for days at a time, which was awesome. I'd send the links to my brother and we'd have a rioutous laugh hahaha
i actually used to be a prankster on wikipedia as well xD i'd edit pages of certain musicians or bands just to make a friend of mine laugh. it was pretty fun, i can't lie! most were reverted within minutes but there was occasionally one that'd slip through the cracks and stay up for a few days.
nowadays, i actually do occasionally edit wikipedia pages to correct or update smaller things; i tend to help out with pages surrounding my hometown since there isn't a whole lot of information on them, or things are severely out of date. i'd love to be able to sit down and help add much more info to pages someday so that there's a more "complete" feel to it. it'd really be the perfect project for me. i love to share information and teach others, and wikipedia provides a simple and accessible outlet for doing so :) eventually, once my writing skills have improved enough, i'd like to be able to help translate stuff for pages and build upon them if they're severely lacking information.