Zach Galifianakis talked about how Letterman would give funny thank you cards to his guests after interviews and what he ended up getting is hilarious!

He said Letterman handed him an envelope in which he thought was a simple card or a gift certificate for a massage but it was something even more surprising!

Honestly, we think it would be a pretty great, memorable gift and a tribute to one of the greatest songs ever written but hey, not our gift, not our opinion!