Related Clues:

• Inspiration for a prank, maybe
• Take a risk
• Appear on 'Fear Factor,' say
• Be plucky enough
• It may make you do something foolish
• Verbal challenge
• Show guts
• 'I ___ you!'
• Chal-lenge
• Take a shot
• Show chutzpah
• Have the courage
• Test one's courage
• Have the nerve (to)
• Have the moxie