Dan Ariely has this autoreply keyed up, so that by typing a single word he can send you this email:
Hi,
This is a very interesting and important topic and close to my heart. But sadly, my life is so full these days that I don’t even have time for the things I’ve already promised to do. I even have a few of my own projects that I haven’t been able to find the time to work on. Not to mention that I have projects with close collaborators that I promised to work on and haven’t been able to.
So while this sounds exciting, I know at the end of the day, it would just put me in a deeper spiral of obligation and place even more constraints than I have now. I hope you understand but I have to decline.
Wishing you all the best and lots of luck.
(Source)