For MST3k fans, rock climbing describes one of the most painful scenes in film history. During episode #208 Lost Continent, there is an unprecidented 50 minutes filmed of rock climbing.
Joel: "Lost Continent? I once lost my keys, but that is ridiculous!"

Ever since that early episode, Dr. Forrester and TV's Frank would make references to terrible scenes in movies, and compare their "nastiness" to rock climbing.