Here’s another joke my friend told me.
What did the school shooter do when the librarian told him to be quiet? Pulled out a silencer.
The School Shooter's Response to Quietness Request in a Library. (Joke). Dark Humor Warning!! 
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Explain Bear
Listen here, you soft-brained simpleton. The joke plays on the dark humor of a school shooter, someone already defying rules, responding to a librarian's request for silence by escalating to violence with a silencer. It's funny 'cause it's messed up and unexpected, ya dig?