How some of the aliens take the form of humans that are dead.
http://www.youtube.com/watch?v=G4nvtVFtu_k&NR=1
"David Moncoeur, one of the Uks most respected researchers gives us the Robert France case - the corroborated story of a man who appeared to have been replaced with a small grey alien who projected a hologram of his victim. This extract from the East of Scotland UFO Conference at the Templar Lodge Hotel, Gullane in 2000.
Thanks to the late Stephen Prior and also to IFDNRG.com the film company who transferred some of the video rights to Andrew Hennessey the conference organiser.
A classic from the famous Dangerous Dave Moncoeu"