Related Clues:

• Went off, maybe
• Called on a pager
• Threatened audibly
• Emulated a smoke detector
• Displayed disapproval toward
• Leaned on a horn
• Paged, old-style
• Sounded like R2-D2
• Confirmed being locked, as a car
• Contacted via pager
• Sounded a car horn
• Summoned via pager
• Sounded like a smoke detector