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"There is a sprinkling of losers like me scattered among the happy teenagers, prunes in the oatmeal of school. The others have the social power to sit with other losers. I'm the only one sitting along, under the glowing neon sign which reads, "Complete and Total Loser, Not Quite Sane. Stay Away. Do Not Feed."
Identify a literary device used here.
What is imagery, hyperbole, or metaphor?