Does David Letterman's booker have a warped sense of humor?

Perusing the upcoming guest listings for "Late Show with David Letterman," Talk Show News was very amused to note that on May 20, Stephen Colbert is scheduled to appear -- along with Brooklyn folk/pop band Grizzly Bear.

For the non-Colbert fans in the house, one of the running gags on the "Report" is the host's deep hatred of ursines, which he refers to as "godless killing machines."