One of the funniest episodes of When Cheese Fails left Jeff and Adam completely and totally confused when a probe starts building pylons and cannons in an empty corner of the map. They tossed up some theories on why he was building stationary combat structures in the middle of nowhere until they go to the player's view to see that he was attempting a cannon rush on a base that wasn't there. As soon as the probe moved into visual range of what should have been the enemy base, the player immediately quit, and thus the introduction of the FAIL stamp. Almost the entire second half of the video is Jeff and Adam laughing uncontrollably while trying to figure out what happened.
Various quotes from Adam and Jeff remixed into a song