Welcome to Day 3 of our new series, "Name That Noise", in which we present some of our favorite sounds from the world of technology and geek culture.
You can listen to today's sound for free, no quarters or tokens needed.
Ready to play? Play the video to "Name that Noise"
Have a suggestion for a mystery sound or one of your favorites? Let me know in the comments or send me an email - firstname.lastname@example.org.
Stumped? Click to the next page to see the answer!