Murray (Rhys Darby), Greg (Frank Wood) and Bret (Bret McKenzie) work with Prime Minister Brian (Brian Sergent)

Apparently, there are limits to Mel’s crazy.

We find this out in this week’s episode of “Flight of the Conchords” as Mel realizes that the new apple of Jemaine’s eye (played by 24 star Mary Lynn Rajskub — you know her as Chloe) is a little too beyond the pale.

And when you go beyond Mel’s threshold, that’s saying something.

But then, Jemaine’s new girl does like to see him dress like Art Garfunkel before they get to business time. She calls it “Garfunkeling.”

The good news this week is that the show was dealing with two good plotlines — Jemaine’s Art-centric lady friend and the rest of the cast dealing with the New Zealand prime minister.

Frazzling Murray beyond his usual state, Prime Minister Brian — who’s not a great dresser and brings his own cheese in a briefcase — throws everything into a wild spin with his arrival. Brian (Brian Sergent) insisting on a presidential visit, and becomes incredibly obsessed with The Matrix after seeing the DVD in Dave’s shop. (“How’d you get this?” Brian asks. “This just came out in New Zealand!”)

(A quick aside: I haven’t mentioned Dave all season — Arj Barker’s foul-mouthed shop owner has served a superb and needed role as confused guru this season. Sorry, Dave.)

Sergent’s work as the prime minister is the episode’s true high point, though. As clueless as Murray, Brian runs the country the way one might run a deli, asking a subordinate to get his cousins to fix the environment.

That’s saying something, considering the other plotline’s as much fun. It starts when the boys are asked to impersonate Simon and Garfunkel, and ends when the real Art Garfunkel arrives.

If there was a weak point of the episode, it was the songs — they can’t be winners every week — though Bret’s Korean karaoke was a true “wait, what was that?” moment. Indeed, sometimes, love can be “as sweet as kalbi [a Korean meat delicacy].”