I still think the funniest for me personally is Sweet Dee Dates a reerun.
Dee dates a guy from HS who is a rapper who still lives at home. He sits in the basement and eats popcorn and drinks juice boxes while laughing uproariously at cartoons on TV. He's a bit of a wiggah who talks in slang. And the whole episode they try to figure out if he's a poser or a reerun.
Especially like the cold intro, where they run down the pluses and minuses. Dee insists he's not reeruned, and Mac asks with a high pitched questioning voice 'would you be able to tell if he was, . . . though?'
It also has the genesis of Dayman.