The Extreme Urgency Flash Sale Subject Line

Act as a urgency copywriter. Help me craft subject lines for a flash sale so urgent that they prompt immediate action.

• Sale Duration: [e.g., "3 hours only"]
• Discount: [e.g., "30% off everything"]

Task: Write 5 subject lines that communicate the extremely short time frame. Use time-specific language and powerful action words. (e.g., "3 HOURS ONLY: 30% Off Everything!", "The Clock is Ticking: the 30% Off Flash Sale Ends Soon", "This is NOT a drill! 30% Off for 3 Hours!").