At first, I thought it strange that someone would devote that much time to something so specific, but then it was pointed out to me that I have over a hundred closeups of pug faces on my laptop. Sigh. So, after looking through this site I got caught up in the spirit of the thing. Then, I noticed that the webmaster's idea of yawn was much looser than mine would be. Some of the "yawns" on the site are clearly barks or moos or meows. One is a statue of a dinosaur with its mouth open. Clearly not a yawn.
The second link is a whole website about how much improv sucks.
I put this up because the person who wrote it obviously has done a lot of improv. Enjoy it fellow improvisers!
Of special interest in the chart that shows the similarities of cults and improv...