TCM is showing the 1940s serial Batman and Robin once a week recently, and the current episode made me think of Rogaine. You see, there's some super-smart bald scientist, and the villain, the Wizard, wants his special detonators for some newfangled explosives or whatever. So the Wizard's henchmen capture said bald scientist, and he won't give up the detonators, and they try to get him to do so. But how to get him to give up the secret detonators? Yes, here's how:
The bad guys have our hero bald scientist captured, and they try to get him to give them what they want, but he says no, so they try to bargain with him, and he says: "What could you possibly have that I want?" Oh, but then the bad guys (in 1940s suits and hats) say: "Hair!" Then they remove their fedoras to reveal long, thick, almost 1980s style metal hair, saying: "Wouldn't you like to have a long, flowing, full head of hair?" Then our hero scientist says: "Yes, I want it, you fiends! Anything... I'll give you anything...!" And then the villains toss him a bottle of Rogaine, and the scientists catches it, saying: "I've heard about this. It regrows hair! I've got to have it ... at any price!" And so our no-longer hero scientists gives the bad guys what they want, and all for the promise of more hair.
Then an announcer walks in front of the screen and says: "Isn't it nice that we live in a time where we can get Rogaine to regrow hair without betraying society to get it? Yes, now you can regrow your hair without having to give away secret weapons to super villains, believe it or not."
Then, as a tag, we could see Batman pull off his mask/hood to reveal a bald head, and he could say: "Really? I can? Where can I get it?"