Mark Linsenmayer (host of The Partially Examined Life Philosophy Podcast) and Bill Arnett (head of the Chicago Improv Studio) each try to teach each other their crafts via conversation, scenes, and what can only be called performance art. No taking turns! 
The Partially Examined Life (Citizens): (Protected Content)
A second venture into this new series (four of which have now been recording; the website should be up fairly soon for all to listen to) where Mark and improv comedy instructor Bill Arnett engage in mutual edification.
