Back in the late 70s I worked in a weapons lab, a private contractor that supplied Lawrence Livermore Labs, military agencies, and a few unspecified clients. We worked on EBW detonators, for you military techies.

We had two tin foil people there, and they favored very different styles.

Amelia, who soldered little gold wires to pins all day, generally wore a tidy little foil cap, like the Jewish yarmulke. It rested on top of her hairdo, a couple of inches from her skull, like the saucer-shaped radome on surveillance planes. Nobody had the heart to point out to her that the design was rather ineffective at stopping the microwaves They were beaming into her brain. Besides, it looked rather stylish, almost rakish, in fact, and because she favored turquoise clothing, the overall effect was a little bit like Indian jewelry.

The other was Jim, I think was his name, a draftsmen. The poor guy not only was being bedeviled by microwave beams, he couldn't work near a window because the CIA was sending laser pulses into his eyes. Or maybe it was the Russians, trying to read the plans by reflection in his eyeballs. Anyway, Jim, therefore, favored the Roman Centurion style of tinfoil hat, with flaps at the sides to deflect the laser beams. Sometimes (I think near the end of the roll, when he was running short), the sides and back were shorter, and then it looked look like one of those Canadian caps with the ear flaps. Nobody made a big deal of Jim's behavior, because we all liked him, and didn't want him to lose his Q clearance to handle nuclear secrets. Let he who was without sin, etc....

Ahh, those were the days...

--Robert