The one and only Bill Murray demonstrated why there couldn't possibly be another one like him with a Late Show entrance that only he could pull off.
The black SUV, the secret agents, the 50,000-volt Taser. The elbow-patch blazer. The man is a national treasure and that's all there is to it.
Later, Christmas came early as Murray and Letterman drank some cocoa, watched the Christmas tree lighting, and got a little frisky underneath the mistletoe.