One of the things I loved about the StarGate SG-1 series was that it didn't always take itself so seriously. They had in-story ways of just completely having fun with the show. Among my favorite episodes are "Window of Opportunity", where O'Neill and Teal'c are caught in a sort of causality loop, like in Star Trek TNG. The options they explore while caught in the causality loop are gut-bustingly funny. And "200"...SG-1's 200th episode just completely takes the series by the short hairs and pounds on your funny bone.