For what is believed to be the first time ever, David Letterman showed up for work but ultimately deemed himself too sick to perform. As such, the Associated Press reports, Adam Sandler, who was to be a guest on Tuesday night's show, stepped in as Late Show's host.

Letterman, who is battling a "stomach bug," will have time to recover since he pretaped Wednesday's show and is preempted by March Madness coverage the rest of the week.