Jimmy Fallon and Tina Fey's 'Lip Flip' Bit Goes Comically Wrong (Video)

The former "Weekend Update" co-anchors make the most out of a bad sketch on Monday's "Tonight Show."

Tina Fey paid a visit to Jimmy Fallon's Tonight Show and the former Saturday Night Live "Weekend Update" co-anchors took part in a sketch gone wrong.

After Fey told Fallon that she's always wanted to interview herself, they trotted out a new bit, "Lip Flip." Let's just say things go comically wrong within seconds when the lips -- superimposed on their mouths -- didn't align correctly. (Keep your eyes peeled at the 2:04 mark.)

VIDEO: Jimmy Fallon, Idina Menzel Redo 'Frozen' Ballad With Classroom Instruments

The duo keep going with the bit, ending their challenged "Lip Flip" tryout with a duet of "Endless Love." (The 3:45 mark is pure comedy.) Because why not.

In the same episode, Fallon teamed with Idina Menzel for a reworked version of Frozen's Oscar-winning song "Let It Go" using classroom instruments.

Watch the sketch below.

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