Ah, that'll be Colonel K.

Remember when Nickelodeon dropped "Dangermouse" from its lineup, and after its final broadcast they did a little surprise bit where people from the network's various original shows ("You Can't Do That on Television" and "Mr. Wizard" and so on) all waved goodbye to Dangermouse, one at a time, and wished him well? Then we saw Dangermouse flying away one last time in his car, saying, "Goodbye, Nickelodeon! I'll miss you."

Man. That remains one of the most bittersweet things I've ever seen on TV. I'm misting up just thinking about it.