Ease of manufacture. For twist off you have to incorporate twist into the mold, while also turning the cap so that it has the right grooves. For pry-off all they have to do is put a blank cap over it and stamp it on.
Oh yeah, it's a lot cooler to have pry-off too! :P
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What's the difference between you and a mallard with a cold? One's a sick duck...I can't remember how it ends, but your mother is a whore!
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