Firing the staff at the TV plays a video clip of Ma'Tok Staff plasma blasts hitting the log targets from the SG-1 series.
Now with sound!
The staff fires, the remote flash sensor triggers the circuit which plays the edited clip thanks to some Linux VLC pause magic on a laptop. Laptop video out to TV.
(See “SG-1 Carter demonstrates the p90” video, about one minute in. Linked as “Video firing sequence” on main page.)
This is the actual clip VLC plays...
This is also fun with “SG-1's best explosions” tube video, as the staff seams to blow up the entire universe.
Since the poor video quality doesn't do the staff justice, here are some still frames to emphasize the live effect.