I always carry a lighter on me, so I'd set myself and the coffin on fire, which killing me and consuming all the oxygen left in the coffin for a quick but painful death.
English
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Here's the thing: if you light the lighter and spend up the oxygen I'm pretty sure the coffin will implode, freeing you
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Freeing you? Yeah under six feet of dirt which will instantly cover you and suffocate you [b]very[/b] quickly
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Good point