Shit yeah, that Nightman episode is godly, one of my favourites too. I often find myself whistling the "Dayman" tune at work, it's catchy as hell. Watched the one where Dee gets pregnant last night and the bit where Mac's talking to her and you just see him talking to a screeching ostrich had me in stitches.
Haven't seen the Country Mac one yet, but Stifler? In It's Always Sunny? Bring it on.
Also, any episode with the McPoyles is always great. McPoyles uber alles.
Christ, what a show.