So I'm interested in everyone else's response at the end. Would you have sat down? What would be your response to the second command to sit?
If I was me I probably would have never made that speech, and I would have remained sitting.
Some of the startups choosing between Javascript and Flash say that this is one of the problems with Flash. If you choose any recent version, some fraction of people won't have it installed, and faced with the interruption of installing it, will just click on Back instead.
Fortunately, that particular brand of nerd can safely be ignored. They are a tiny, tiny minority who make a lot of noise on websites such as this.
Seeing what Heroku has done has encouraged us to keep going, but we wonder if picking pure javascript really was the wisest choice.