Simon Bird, James Buckley, Blake Harrison and Joe Thomas were asked to put their vocal cords to the test during a visit to BBC Radio 1, and they happily obliged.
What started as a (slightly) tuneful performance soon escalated into a fit of laughter and screeching, with DJ Matt Edmondson providing encouragement before finally removing his headphones.
The boys recently admitted that The Inbetweeners will not be returning, now that they have finished promoting the second film.
"There's no third film," Bird said. "This is genuinely our last interview ever. Ever, ever, ever."
The Inbetweeners 2 is released on Blu-ray and DVD on December 1.
Watch a trailer for The Inbetweeners 2 below: