natural gas bomb. Those who sniffed the gas fell into a coma, and the few that could outrun the hazardous waste were only safe for a few seconds until the relentless cloud caught up with them.
And so it was that all the world was wiped out except for Marge and her beloved Barney. As they walked off into the sunset, Barney in Marge's arms, they each held a glowstick and they were happy.
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A conservative is a liberal who's been mugged.