Have you heard of The Vanishing People? One minute they are there and the next minute...poof, they are gone.
On June 29, 1968, Jerrold I. Potter disappeared out of a plane in the air over Missouri. If indeed he fell out of the plane, which family and witnesses said didn't happen, no body was ever found along the flight path.
On September 3, 1873, James Worson disappeared while racing nine miles in front of his two "friends", one was a photographer that was taking pictures of his journey.
On September 23, 1880, David Lan disappeared walking in the field in front of his house, allegedly in front of five witnesses, including his family.
The Vanishing Prisoner Diderici of 1815, he was chained to other guards walking in a line and faded in front of everyone.
Yes, people disappear every day, but disappearing in front of other people...now, that's strange. The above stories could be explained through other means, and maybe some are hoaxes. Who knows?