In the same spirit as last year's "ParmaNoises",
Frank again made a little sound
experiment by recording a certain noise and modifying it quite a bit. The idea was
to play this sound at the end of the conference and let the audience guess what it
is. Due to time constraints, we couldn't do that, but you can now take a guess:
Now, if you have listened to it and made your guess, here's a spoiler..
..and the full explanation.