Spread the snacks more widely. Perhaps a hostess trolley?
Cherry brandy = evil.
Start games early, or not at all.
Never arrange to give something back to someone at a cocktail party.
Lay off the f***ing absinthe, however nice it seems at the time. Also the Sambuco, overproof rum, chemical alcohol, Stroh and other instant doom style drinks (includes Zombies and Long Island Iced Tea).