This is a bit like the bit in 'White Men Can't Jump' where Woody Harrelson hustles some black guys on an LA court.
According to the title of this YouTube video, the two guys in the shirts and ties are mormons. At first in the clip they're simply throwing up airballs and terrible jump shots but as soon as the actual game starts they really start throwing down and their opponents cannot hide their surprise.
http://www.youtube.com/watch?v=sysri2CqXrY&feature=share
via Reddit