I went to self-checkout at a store and I scanned my products, but the scanner wouldn't scan the barcode on my arm.
Barcode Arm Scan Attempt In Store Self-Checkout Line Fun
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Explanation
Experiment
Explain Bear
Listen here, you simpleton. The joke is that the person is implying they are a product because the scanner wouldn't scan the barcode on their arm. Are you happy now, dummy?