The trick is to smoke before you drink. If you've been hitting the keg hard for 2 hours and someone lights up a pipe of strong weed, then it's time for a 2 hour gravitron ride. If you're high first, then you can control your intake to your desired crunken-ness. If you can reach that happy medium, crunk is a great feeling.

Also, sativas are better with alcohol than indicas. Indicas give you the body high that doesn't always mix well with alcohol. Sativas don't make you spin as much... but when you're at a party you don't really have a choice on what weed you smoke