Irritatingly intelligent quizmaster is one perception of Alex Trebek. Trebek shows his relaxed side in some appearances outside Jeopardy! Click on the pic for bigger size. Instead of hotlinking, please place the image on your own server or a image hosting service.
From left to right:
Disclosure: I couldn’t find a photo of Trebek donning a sweater in decent quality. A screencap from a VHS tape source will have to do. Also, the CPS screencap is mirrored.