Falcon Lake Incident
One of the best documented cases of physical trace evidence is known as the "Falcon Lake Encounter." Occurring on May 19, 1967, the lone participant was Stephen Michalak, who was a mechanic by trade, but his hobby was prospecting for silver.
He was enjoying his favorite pastime when he encountered two UFOs, and actually touched one of the unknown flying objects that had landed in his vicinity.
The first object remained on the ground for 45 minutes. It made a whirling sound and gradually changed in colour from grey to silver. Then a hatch opened and the object emitted a bright violet light. Michalak claimed that he heard voices from within. He called out to the voices in English, German, Italian, Polish, Ukrainian and Russian. There was no response; instead the hatch closed quickly as if the inhabitants were spooked. Michalak reached out and touched the object as it began to revolve and take off, and he was instantly pushed back by a force of hot air. The blast burned his clothing and left marks on his chest. After he ripped off his clothing, Michalak felt ill. He began to vomit and noticed a metallic smell coming from inside his body, like the burning smell of an electric wire or an electric motor.