I jump and scream for a ton of reasons.
When it gets to quiet I just randomly jump and scream to break the silence.
When other people scream it freaks me out so I scream as well.
When I am watching a movie and something pops out.
When people sneak up on me while I am reading a book.
When the doorbell rings or my dogs bark.

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I'm olny human, I make misteaks.