"Drinking the Kool Aid" came about as a result of the 1978 mass "suicide" at
Jonestown, Guyana, wherein cult leader Jim Jones served 'kool aid (note the
non-capitalized text)' laced with poison to his constituents. At first they
drank willingly, being the trusting faithful, until people started to die
from the poison. At that point, the rest were forced to drink.

The drink was not actually "Kool Aid" brand, but another brand, whose name
escapes me at this point.

Hear that David Eduardo, drinking the Kool Aid, being the trusting
faithful,
people started to die from the poison. At that point, the rest were
forced to drink.

We'll all be forced to drink the kool-Aid. Doomed I say. Oh the pain,
the pain.