Has Stephen Elop ever looked angry?
Every single image we see of him shows the guy looking abnormally excited and happy. What gives? I think this gives credence to the theory that people are generally as happy as they are ever going to be. Some peoples baseline happiness level is lower, others higher, and Elop seems to have a level above the clouds.
A more jaded theory about the man is that tech sites like finding the goofiest pictures they can find of these guys, and Elop tends to provide that more often when he expresses happiness. It's like seeing Matias in some Lady Gaga-esque regalia and not posting THAT instead of something more normal looking.