On the old Heinz ketchup bottles made of glass, you could find a 57 on it. If you tipped the bottle over to get out the ketchup and hit the side of the bottle right on the 57, it's supposed to help get the thick ketchup flowing and out of the mouth of the bottle. Watch out though, since you want to have control of the speed and amount you take from the bottle - control is not guaranteed. Smacking the 57 mark does help. This is only for glass bottles, though.
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