dorky punctuation humor

(Is there another kind of punctuation humor?)

Knowing that phrasal adjectives preceding the nouns they modify are supposed to be hyphenated (unless they begin with -ly adverbs), I read "first period class" as referring to one's first class about menstruation—your first period class.  Ha ha, I'm all grown up when it comes to grammar, but otherwise I'm 12 years old!

Is this sign really necessary?  Doesn't everyone know that bestiality is best confined to the privacy of your own home?

Thanks, I'm here all week.