Hope you enjoy your vacation, Optimist.

Alright then, just to spur everyone else on...
@ Warrior: Mall security? It's possible. Nothing particularly major, but security could have been called on Shawn due to him being particularly belligerent or verbally aggressive. ("Twenty bucks for a goddamn cup?! Are you fucking kidding me?! I'll give you two.") This would probably mean that Shawn is fairly nervous around the man.
@ 4week: Due to her working at the library, he'd probably at least know Laura and have talked to her several times. Although I doubt he'd have made any particularly great impressions on the girl.
As for the rest, again, Shawn rarely makes good first impressions. He'd probably [i]try[/I] (and fail) to get along with Rebecca, due to liking her taste in books. How do you think she'd react to him, though?
Probably wouldn't try too talk much to Peter or Adam, due to their reserved nature.