When, if ever, is it ok to eat the last part out of a unusual container like gallon ice cream, OJ bottle, etc?

Never! Disgusting slobs like you sicken me!
Last portion? Have at it and ♻️!
Depends on who, when & what
Story time!
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When, if ever, is it ok to eat the last part out of a unusual container like gallon ice cream, OJ bottle, etc?
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