stevenz: The Five(Ish) Doctors Reboot" is pretty hilarious.
http://www.digitalspy.co.uk/tv/s7/doctor-who/news/a533437/doctor-who-50th-peter-davison-in-fiveish-doctors-rebootwatch.html
I enjoyed that very much.
I suggest everybody who thinks they know how many Doctors physically appeared in The Day of The Doctor should watch it right to the very very end of the credits :-)