BTN.com staff, May 21, 2015

Wednesday night was all about David Letterman, and for good reason.

It was the final "Late Show with David Letterman," this after two-plus decades of making America laugh every weeknight at 11:30 p.m. ET on CBS.

Taking Letterman's place, of course, will be Stephen Colbert, a 1986 graduate of Northwestern?s School of Communication.

Well, on the final show, before saying good-bye for one last time, Letterman wished the Northwestern grad the best of luck.

"I'm very excited," said Letterman in the video above about Colbert. "I think he's going to do a wonderful job, and I wish Stephen and his staff and crew nothing but the greatest success."

Colbert will take over the "Late Show" on Sept. 8.