Created by AKQA, this video Christmas card shows “49 microwave ovens stacked on a wall, all set to play Jingle Bells.” No other songs have been programmed yet. Video after the break.

First, finding the microwave ovens with the right “ping”, so they could have the notes required to play Jingle Bells. Then, setting up the timers so, when the cooking time was done, the pings created the song.

[via Gizmodo]