Here's an amusing game for all you coal-hearted misanthropes out there. Next time you find yourself lurking in the corner at a party, watching the disgusting fun unfold around you, start saying the word "despair" out loud. Begin the incantation at conversational level, then increase the volume incrementally until someone asks you to leave. I guarantee you'll be bellowing at the top of your lungs before anyone even notices. If you're lucky, someone else'll join in, and then you've made a new friend. I know; I've tried it myself.
The only solution, as I see it, is to swap the fun/no fun balance in everyday life. I'd prefer it if the entire year consisted of one long party, punctuated by bursts of compulsory stony-faced toil, preferably doled out in the most fascistic manner possible: two hours of serious work a week, overseen by jack-booted stormtroopers who'll thrash you into a coma if you so much as chuckle before the all-clear sounds. Global efficiency levels would sky-rocket. Better still, our quality of life would improve dramatically. And that'd give everyone real cause to celebrate. Not party. Celebrate.