Did anybody catch Conan O'Brien last night? He was doing a little sketch in which he watches made-up (and purportedly hilarious) cable channels, and one of them was the "Columbo Screen Test Channel". They went through two guys who were pretty dreadful, and then they went a a third guy who had his back to the camera. He turned around, revealing our very own Peter Falk preparing to do his best Columbo schtick... but before he can start, the director says, "Ugh! No. Thank you, no." Falk, looking stunned, shuffles off.
It was quite amusing to Peter doing a cameo like that! It was definitely a pleasant surprise.