I don't know about you, but I haven't laughed as hard as I did last night a long time. I'm talking of course about the fourth season premiere of FX's deliriously zany comedy series It's Always Sunny in Philadelphia , which aired two gleefully inappropriate back-to-back episodes last night ("Mac & Dennis: Manhunters" and "The Gang Solves the Gas Crisis"), the latter of which was written by new writing staff additions Sonny Lee and Patrick Walsh , who also write the series' equally hilarious Paddy's Pub blog . (If you haven't yet checked out Paddy's Pub, please do ASAP. It currently features excerpts from Dennis' erotic memoirs, behind-the-scenes videos, and Ask Dirty Frank.) Last night's painfully funny installments didn't feature the gang learning any valuable life lessons, maturing in any fashion, or throwing off their outmoded ideas about energy consumption, cannibalism, or, well, hunting a man on the streets of