Related Clues:

• Musical's masked man
• Oct. 31 goal
• What Casper tries not to do
• Go to often
• Be there in spirit?
• Cause alarm to
• Go to a lot
• Cause fear in
• Suddenly spook
• Give a turn
• Adrenaline producer
• Say 'Boo!' to, say
• Be an effective ghost
• Do ghostly work
• Visit habitually