X-Ray specs! I wanted a pair of those as a lad, and later in life I got some!
1977, working for HM Govt., I was making a model of a tool, with 2 cardboard tubes from toilet rolls, and for a laugh glued 2 ping-pong balls in the ends, painted on red irises and 'veins' and wired up a couple of arms each side. A bit of black tape made them look real technological. A colleague I shared a small office with started 'leering' out of the window at the office-girls going by with them, (you couldn't actually see a thing). I told this girl in the canteen they were the new 'X ray-specs' for the British Army. (Actually, like an idiot, my exact words were: "It's the new "De-nuder", for the squaddies. Top Secret, don't tell anyone!"). Such is the gullability of people, the following happened in quick succession:
a) Suddenly NO girls went past our window, all seemed to prefer a 200 yard detour to go a mere twenty feet.
b) Every other man on the plant descended on my office on some pretext, sometimes 6 at once, demanding to try out the "Denuder" urgently for their project. It was always 'out on trials at Otterburn moor', or 'up in London with the brasshats', or 'being upgraded'- we were enjoying this!
c) Got a call from the Director with a curt-"Mister Belson. De-nuder, my ar*e! Get rid of it!"
Ah, Fun while it lasted.
Alan