An X-Ray of Nathan Coppedge's chest reveals a strange figure: what appears to be a plastic doll with the head of a dog-pharaoh. Wouldn't it be weird not to know it was even in there?
Either I swallowed this doll into my lungs somehow or there's some surgery I don't remember... Come to think of it, I think my brother Brian stuffed the doll down my throat to fulfill a fate-bargain I made to help in teleporting between two airplanes!
The account of how the teleporting involved time-traveling to 1990 is given in The Dimensional Time Travel Toolkit, published in 2015.
The experience is mentioned at Quora HERE: https://www.quora.com/If-you-went-back-in-time-15-years-what-would-you-do/answer/Nathan-Coppedge