Related Clues:

• Unspecified, but invariably unpleasant, alternative
• To avoid the alternative
• '___ what?' (response to a threat)
• ''Otherwise . . .''
• Menacing words
• Unfinished threat
• Fight souvenir
• Ultimate words in an ultimatum
• Words suggesting serious consequences
• Result of a punch, maybe
• "Do it ___!"
• End of an ultimatum
• Goon's last words
• ''Otherwise, you'll regret it!''
• Scuffle souvenir