Welcome to Day 4 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'll need limber fingers to figure out today's mystery sound.
Ready to play? Watch 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!