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Local legend claims a mystery airship crashed and its pilot was buried in 1897; historians regard the story as an unverified, likely fabricated hoax.
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Claimed 1948 crash and recovery similar to Roswell, widely regarded by researchers as a hoax originating from a con artist's story.
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US anti-aircraft batteries fired over a thousand rounds at a perceived aerial intruder over the city; an Army review attributed the alarm to a weather balloon.
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A Florida photographer's widely publicized series of UFO photos sparked national attention but is now regarded by most researchers as an elaborate hoax.
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Reported UFO/debris event in Washington state days before Arnold's sighting; long since concluded to be a hoax.
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Ufologist Jaime Maussan presented two small, three-fingered mummified specimens to the Mexican Congress; Peruvian authorities determined they were fabricated from human and animal bone.
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Purported top-secret papers describing a 1947 government panel managing alien contact surfaced anonymously; the FBI and most researchers concluded the documents are forged.
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A series of formations of lights over New Jersey turned out to be a hoax using flares attached to helium balloons.
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A viral 2015 claim of photographs showing an alien body from Roswell was subsequently identified as a mummified Native American infant.
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Massive 1908 Siberian explosion sometimes claimed by fringe theorists as an alien craft mishap; mainstream science attributes it to an airburst meteor or comet.