Piedmont is known for being full of seriously nice houses -- we always joked that the city's raison d'etre is so that rich folks wouldn't have an address in Oakland (okay, we bear a grudge -- we were denied a pass to the Piedmont tennis court because we lived three doors down from the city line). But David Letterman has made the kids at Piedmont High known across the country thanks to a quirky rite of spring -- an annual bird-call contest.

Every year, the winners get flown to New York to appear "The Late Show." So we were excited when we tuned in to Dave tonight for the first time in a while and saw that they'd be the guests! After the monologue, a visit with Rupert at Hello Deli (check out the interview at Gothamist), some jokes from behind his desk and a commercial break, they came on.

One of the kids, when asked why he entered the contest, admitted "our teacher needed some help with it, because people weren't doing it." All of them are just cute as buttons, and the way they totally sell the birdcalls is hilarious. Check out the clip over at the Late Show website.