Related Clues:

• Hardly stay cool
• Heart-pounding event
• Blow a gasket
• Lose one's marbles
• Common cell phone feature
• Fill with fright
• Do ''Boo!'' to
• 'War of the Worlds' effect
• Loud get-up?
• Reason to get up in the morning?
• Totally lose it
• Break-in indicator
• Flip one's lid
• __ beans
• '___, crackle, pop'