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On 20 May 1967, Steven Michalak claims to see, and be injured by, a UFO near Falcon Lake, Canada.
This incident is Case 50 in Isaac Koi's "Top 100" article, since it was referred to in 54 of the books covered by that article.
This was Project Blue Book Case Number 11768.
This incident featured in a document (“the Rockefeller Briefing Document”) endorsed by Dr Mark Rodeghier (President of CUFOS), Richard Hall (Chairman of FUFOR) and Walter Andrus (President of MUFON) as containing “the best available evidence for the existence of UFOs”.