(Wikipedia victim of onslaught of April Fool's jokes)
"Today Wikipedia, the free encyclopaedia that anyone can edit, was the victim of an onslaught of practical jokes, as April Fool's Day kicked in in various timezones around the world. Wikipedia contributors were kept busy tidying up and removing prank articles and changes made by other Wikipedia contributors, and were expecting to be cleaning up the aftermath for days afterwards.
"The most highly visible prank was the prank 2005 Britannica takeover of Wikimedia encyclopaedia article ..."
2005 Britannica takeover of Wikimedia (it's very funny)