I Know I Know I Know goof up.

Source: : wojo4hitz

Tegan points out a girl who is giving them the finger (chatter starts around 2:06).

Source: planegoesdown

Tegan won't stop playing despite Sara's goof up.

Source: weaverash01

Tegan goofs up "Are You Ten Years Ago" - around 1:00.

Sara goofs around on the keyboard during Soil Soil Call It Off.

Source: nietzcheisdead

Sara goofs up Like O Like H in Berlin.

Source: LennaPiret4eva

Sara after goofing up "I Bet It Stung."

Source: KinkyKelly83

So Jealous goof up/remix.

Source: screamdestiny

Sara goofs up O like H.

Source: solonstripes

Tegan forgets the words to Call It Off.

Source: angelasexton

Sara goofing up Relief Next To Me in Montreal.

Source: marchingstars

If Tegan was to create a time machine...

Source: moviegrl02

Goofing up Monday Monday Monday.

Source: abmackay