Cyber Pong

I saw this over on engadget today.
Ping-Pong (table tennis for you Brits) is already the lazy man’s sport,
but some company decided that it’s still too strenuous. Now you don’t
even need to be standing.

Using a cell phone with a camera, you can play a round of virtual ping
pong against a friend in the office without paddles, without a table
and with no balls.

Pun absolutely intended.