Psych: Murder?... Anyone?... Anyone?... Bueller?

Gus is in charge of his and Shawn's high school reunion and he wants the night to go perfectly. He warns Shawn not to mess things up, then instructs him to go find more folding chairs. While Shawn heads to the cafeteria with Abigail, his high school crush, he sees, out the window behind her, someone fall to their death from the roof. But by the time they grab Gus and head outside, there is no sign of a body. Gus and Abigail don't believe anything happened, but Shawn claims the victim was wearing a letterman's jacket and, after they walk away, he spots part of a lapel pin in the grass.