[PAR35]

The drink was Kool-aide, hence the expression. I wonder how many under 50 realize that was the origination of the expression?

"Electric Kool-Aid Acid test" - as best I can recall, it involved an event at a (Unitarian?) Church, where the instructions weren't clear as to the beverage being laced with LSD. So it probably dates back to Kesey and the Merry Pranksters.

[El Laton Caliente]

I’ve read the book. Drink the Kool-aide was in use before Jamestown. Jefferson Airplane headlined for Ken Kesey and the Merry Pranksters in the early 1960s at a series of “Electric Kool-Aide Acid Test” performances.

Drink the Kool-Aide meant on LSD back then...

[a fool in paradise]

The Kesey/Prankster phrase was “are you on the bus”