Perhaps others will not see the humour I see in this warning sticker, but I think it’s hilarious.
I feel this is an area where a written warming may be more effective. Call me crazy, but I think a sign that says “DON’T STAY IN HERE TOO LONG WITH THE DOOR CLOSED OR YOU WILL DIE!” would do more to instill fear of CO??? exposure than a rag-doll stick-figure taking a nap inside a triangle.