La Bamba/Twist and Shout

In this totally candid moment, Joseph Gordon-Levitt leads his pack of co-stars and crew of Uncertainty in a random behind-the-scenes moment. Louis Arcella, who plays the uncle of Gordon-Levitt's girlfriend, makes a rather gallant effort in song and dance, while the others sing along and laugh. We also spot Olivia Thirlby and other co-stars capturing the moment on their cameras.

Baby It's Cold Outside

The Muppets Christmas Special is always a treat to watch and re-watch — this time, they've roped in Lady Gaga (who cleans up well in a stunning red Azzedine Alaïa number) and Gordon-Levitt in a chaise lounge, complete with a fur throw. Baby It's Cold Outside is the steamy Christmas number, one that's laced with old-school cheekiness and sexual tension. Who better to refresh the song that's been covered to death than the duo, whose gender roles are reversed with Gordon-Levitt singing the female part — it's traditionally sung by a male.

What Are You Doing New Year's Eve

Wasn't (500) Days of Summer one of the movies you just loved to hate? It was hipster-central in all its aspects — from the record store scene and Belle and Sebastian shout-out to Summer and Tom bonding over their shared love of The Smiths. It did spawn a desire in fans for Gordon-Levitt and co-star Zooey Deschanel to be together in real life, a pairing that's been shipped for years since the movie's release. We were devastated when they each married their respective spouses (why, God, why?) but we still squealed whenever they get together in music.

La Valse à Mille Temps

Yes, he speaks French. In fact, Gordon-Levitt studied French poetry at Columbia University. Sure, his vocals don't quite match up to the Jacques Brel original in 1959. Still, the actor captures Brel's playful charm in this song that just gets faster and faster.

Sexy Motha

Do you want a girl who likes to eat organic; has a big, fat vocabulary that makes you just want to give your chromosomes a happy home? We never thought those attributes would end up in a song, but Gordon-Levitt sings them with pride. This track is the ultimate ode to mums everywhere.