Yoshitennis.zip
From Mario Fan Games Galaxy Wiki
In September of 2003, Yoshiman had submitted a zip file containing sprites of Yoshi from Mario Tennis in the Submit-It forum. The filename was Yoshitennis.zip. Due to the automatic swear filtering at that time, the text changed to "Yo****ennis.zip," and that newly-created unknown file was uploaded instead. Since then, the filter became a running joke/in-joke.
The file was later name-changed to the original, to be correctly submitted to the site. You can see said file here.
