We, the cast and crew, were working late in the theater at Ft. Carson, Colorado preparing the set for "You Can't Take It With You." And I mean late -- it was about 2 a.m. (0200, because we were in the Army) when we looked up and saw two Military Policemen at the back of the theater watching us. We invited them to come for coffee, but they ignored us and when we looked back they were gone. THEN I realized that a) they would have been from my company (I was in the MPs at the time) and I didn't recognize them, b) they were in summer short-sleeve khakis and this was December and they should have been in class-A wool uniform, and c) their uniforms were from the late 1940s or early 1950s.
You figure it out, because we couldn't.
Oh, yeah -- we finished the set and the play was well received.