Houseboating a number of years ago, I came across a wonderful invention. Drunkenly, I started to pour one, realized my mistake, then added the correct other kind.

I'll gladly share it in this thread.
Fill up a mug with ice.
Pour count of 5-6 one thousand one's of Jim Beam.
We then like to pour 1 less count of Captain Morgan Spiced Rum.
Add a can of coke.

We call it Party in a glass!!!

Never got sick on it (after drinking a ton of them).
Never had a hangover.