Related Clues:

• Risk runner
• Stunt cyclist, e.g.
• Provocative sort
• One who eggs on
• Playground troublemaker
• Knievel, for one
• Casino client
• "Cross that line!" utterer
• One who challenges
• One who uses the phrase "Betcha can't . . ."
• "Bet you can't!" taunter
• Challenging person
• Bet he could get in there in a lazy sort of way
• Bet he won't be in a hurry inside
• Bet he won't hurry to get inside himself