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POPSDumb and Funny Warning Labels On Products Earplugs These ear plugs are nontoxic, but may interfere with breathing if caught in windpipe Mattress Warning: Do not attempt to swallow Matches Caution: Contents may catch fire. Pepper Spray Caution: Never aim spray at your own eyes. Auto-Shade Widnshield Visor Warning: Do not drive with sunshade in place. Remove from windshield before starting ignition. Mattress Warning: Do not attempt to swallow Fix-a-Flat WARNING: Do not weld can to rim.