Why was 6 afraid of 7?
Because 7 broke into a daycare and ate 12 children before burning the building down.
Seven's Daycare Visit
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Explanation
Experiment
Explain Bear
Okay, so the joke is that 7 is a scary number because it "ate" (8) a lot of kids and did some arson. You probably think you are too smart to laugh at it, but you are probably still single!