What are the mixing rules for Alcohol?

I know that its liquor before beer and your in the clear. Beer before liquor and you'll be even sicker. I also know your not supposed to mix vodka and rum... I think. what aren't you supposed to mix. Please list all that you know and only from experience preferable from college people.....LETS GOOOOO WVU LETS GOOOOO MOUNTAINEERS!!!! CLASS OF 2015