Related Clues:

• See 50-Across
• Throat-clearing sound
• 'Excuse me'
• 'Forget it!'
• 'Yuck!'
• Sound from the bleachers
• 'Pardon me'
• Scrooge's cry
• Heckle, in a way
• 'Psst!'
• Greet the villain
• Cry in the dark?
• Show disapproval
• Attention-getter
• Jump causer