David Letterman Announces Retirement: Here Was His First Guest, Bill Murray (VIDEO)

As US late night talk show host David Letterman announces he'll be retiring in 2015, here's a priceless clip from his very first show, back in February 1982.

Letterman's very first 'Late Show' guest was the inimitable Bill Murray - and his 'interview', to use the term loosely, involved Murray improvising on flights of fancy... before and rounding it all off with a rendition of Olivia Newton-John's hit 'Physical'. No, really.

Click play above to watch the 13 minutes of rather bonkers, very Bill Murray-esque, silliness.

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