Heather passes out after drinking too much at an office party and wakes up with an unexplainable hickey, prompting her co-workers to go on the hunt to find out who gave it to her. Jen tries to make rock star Dave Grohl her new BFF. Sarah has a mystery package delivered to the office. When Chelsea hijacks it without exposing its contents, Brad, Josh and Steve become obsessed with discovering what is inside.
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