On Sunday 6 July, Russian student Ana Zhmaeva filmed on her smartphone what she thought was a mid-air plane crash over St Petersburg, Russia.
In fact what she recorded was a 'UFO', in the most literal sense possible. No, we don't mean 'UFO' as in aliens, what we mean is quite literally it is an 'Unidentified Flying Object'.
Having recorded the explosion, the student then reportedly sent the video to the local police fearing that it had been a mid-air collision between two aircraft.
This is where things start to get a little strange. According to the Express, the Police contacted the local air traffic controllers and discovered that not only was there no recorded incident, but that there had been no recorded aircraft in that area.
Add to that the fact that a local airshow had no reference of any planes leaving their own fly zone and you have something of a mystery.
The mystery has one final twist though, which is that when Police went to investigate what they predicted would be the crash site they found nothing. No evidence of debris, no eyewitnesses of a clear up, nothing.
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This leaves us with pretty much only two alternatives: That it's either a UFO and this is all part of a government conspiracy to hide it, or that it's some form of secret military experiment that again is being hidden by the government.
There's always the 'swamp gas reflecting from Venus' trick...