They ran Spacewar on a real DEC PDP-1 in Computer History Museum in Mountain View, CA 3-4 years ago, and let us play it ourselves. The presenter was one of the developers worked on it IIRC.
Stephen Russell was talking to the participants and Peter Samson was actually operating the PDP-1... my guess is this was a regular thing for them.
An interesting note... not only was Stephen Russell a creator of effectively the first computer video game... he wrote the first Lisp interpreter based on John McCarthy's paper.
John McCarthy, in an interview quoted in http://www.paulgraham.com/icad.html . Anyone lucky enough to meet Russell at CHM should ask politely for a photograph with him.