Orange traffic cones which mysteriously appear after drunken parties, and other weird stuff the clean-up crew encounter. -- Knitnan
Of all the unexplainable phenomena in the known universe, the most unsolvable is that of humans and spontaneously-manifesting traffic cones. They only appear when everyone at the party is too inebriated to recall where they came from, and no means of recording said party have ever picked up where they come from. Even security cameras can't catch their appearance. Whenever the cameras are turned, or cut away, that's when the traffic cones appear.
And in the cases of fixed, one channel feeds, the item appears outside of the immediate pickup zone. And holographic recorders experience unresolved issues in the area of appearance.
It may be unexplained, but science is determined to die trying to do so.