https://en.wikipedia.org/wiki/Scunthorpe_problem
Few years before the AOL incident I recall watching a news story about internet filters (in schools... I believe) blocking information on Superbowl 30, which is stylized with roman numerals, as Superbowl XXX. I remember this 25 years later because it was so amusing to me. Still is.
(XXX is sometimes used to denote sexual content.)
Oh, hey! Wikipedia actually provides a citation for the Superbowl XXX incident!!