Neil Patrick Harris and Mike Tyson in Tony Awards Opening Number

It's one of the hottest videos on Youtube now.  Neil Patrick Harris of "Doogie Howser" and "How I Met Your Mother" fame performed an incredible number at Radio City Music Hall this past weekend to open the Tony Awards.  Mike Tyson even made an appearance in the set along with camera shots of scores of celebrities in the audience.  If you missed it, you really have to see to believe.