In the Silver Age, you could count on your heroes getting exposed to a lot of Random Ray Usage (tm!)! Rays were to DC what magnets were to Marvel: They could be used to kick-off virtually any plot device that came into your head.
Thusly, from Detective Comics #301:
And as a result of this, Batman couldn't be exposed to air, like John Travolta here:
Coolest. Hamster. Ever.
And then there was the time that very next issue that a ray turned Batman and Robin in to bronze:
I know. But every time you hung in there for that sort of thing, you'd get this:
Robotic Alien Creatures!
Because making the alien creatures robots this time keeps things fresh. You see, otherwise you might think they were in a bit of a rut.
Hey! Let's learn something!
Since they didn't tell us how the meeting went, I can only assume that one of them snorted too much coke beforehand and went on a spree, killing everyone at the meeting and then turning the gun on himself.
See, kids? Using your imagination makes things more fun!
See you tomorrow!