WU LYF made their network television debut last night (January 4), and, surprisingly, it wasn’t by appearing on Fallon or Craig Ferguson, the two late night shows with the most progressive talent bookers around. Instead the Manchester band hit The Late Show With David Letterman to perform the elegiac “Heavy Pop,” from their debut Go Tell Fire to the Mountain. Lead singer Ellery James Roberts tears his throat up during the song, as usual, but what’s most curious is what he shouted at the end of the song — CBS censored it, whatever it was (perhaps “What’s up motherfuckers?”), but it was probably responsible for Letterman’s nervous post-performance laugh. Watch their performance above, but you can also fast-forward through the whole episode that plays next to catch the band leaving the stage after shaking hands. They may not be as reclusive as they once were, but WU LYF are still too cool to bow and smile for a TV audience.

Go Tell Fire to the Mountain is out now on the band’s own LYF label.