Related Clues:

• Challenging request
• What someone looking for action might say
• "Volunteers?"
• Challenging question
• 'Who wants to volunteer?'
• 'Who wants to step up?'
• Proposal phrase
• 'So ... who's in?'
• 'So ... who wants in on this deal?'
• "Who wants to volunteer?"
• "Does someone want in ... ?"