Unfortunately, this clip of Tegan and Sara doing “Call It Off” on Letterman features far fewer phones than the official video. The Canadian duo dropped by Letterman to promote The Con (which seems like its been out for roughly three years), and they do a good job of conveying the song’s tenderness in a live setting. Dave must really dig Tegan and Sara, because not only does he promise his audience they’ll enjoy the performance, he is able to tell which twin is which. [Stereogum]