jhaluska

You can make it visible with a web camera.

Is it odd to thank somebody for waterboarding you?

I was pretending not to be very nervous, tried to play it really cool,

How do you respond when people get nervous around you?

Has anybody ever thanked you for a negative review of one of their films?

The audio trick is cool, but they'll only get you so far. Here's my advice for the long run. Basically just modernize the stadium flip card.

1. Treat each seat as a RGB pixel.
2. Have the user put in their seat number.
3. Each user pre-download a single pixel video stream for that location.
4. Just use the audio trick to start and synchronize the playback.
5. ???
6. Profit

Done properly and you just turned the stadium into a low resolution video.