Things on Wikipedia that have made me laugh include...

• ...when Ice Cube was a plain word and not a person.
• ...when I learned Sharknado was based on "probable events".
• ...this simple, blunt edit summary.
• ...when I confused Legobot about adding a GAN so badly, it had to try not once, not twice, not thrice, not four times, not five times, but six times to actually get it right. Even when I tried to add it, the bot reverted me. Why? Because I forgot to capitalize the "F" in "Film" for the subtopic. It's funny because I'm stupid.
• ...when an IP editor undid vandalism with masterful deadpan
• ...when Kuru commented on the vastly improved career of a cinematographer.