I'm not sure, but I think you might be referring to an episode of his early television show, RE:Brand (http://en.wikipedia.org/wiki/RE:Brand). I loved that show! Yay for straight men with penises in their hands, yeah?
Ah, nevermind, flowers is right. I think it's high time I actually WATCHED this Ponderland business. If you hadn't already guessed, I also say, "Yay" to horse-love.