Why was 6 afraid of 7? Because 7 was a registered 6 offender.
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Explanation
The joke plays on the fact that '7 ate 9' sounds like '7, 8, 9'. It's a pun using '6 offender' which sounds like 'sex offender' to create a silly, unexpected reason for 6 to be scared of 7.
Good one
Started to skip this cause I thought it was the old passe joke. So glad I didn't