Related Clues:

• Sort of signal
• Medical alert?
• Timer sound
• Pager's sound
• Traffic jam sound
• Microwave emission
• Reaction to Wile E. Coyote
• Sound from a pager
• Answering-machine sound
• Voice mail sound
• Dinner interruption, '90s-style
• When repeated, 'Out of the way!'
• Road Runner retort
• ... Road Runner
• Road Runner's call