In Wednesday's episode, titled "Shawn, Interrupted" — an homage to the 1999 girls-gone-actually-crazy film Girl, Interrupted — Shawn must admit himself to a mental institution to keep an eye on a recently convicted murderer who pleaded insanity but they suspect to be completely, well, sane. But before he and Gus catch the bad guy, Shawn's got to convince Nurse McElroy (played by Brat Packer Molly Ringwald) that he's actually suffering from something.
"They tell me I've got something called narcissistic personality disorder. But, the truth is, this lustrous hair and dimpled chin are merely Chapter 1," Shawn says before listing off such life-threatening ailments as "outrageous intelligence syndrome" and "obsessive successful disorder."
"Goodness, I've never encountered a patient who suffers from so many diseases that don't exist," Nurse McElroy (Ringwald) tells her new patient. Shawn's explanation? He says he's from the future. Apparently, it won't be that hard to convince the nurse he's lost his marbles after all!
Check out the exclusive clip from Wednesday's episode:
Psych airs Wednesday at 10/9c on USA.