Psych season 7 episode 11 "Office Space"

Shawn gets a middle-of-the-night visit from a frantic Gus telling him that he "screwed up bad". Gus says that he finally stood up to his horrible boss, Dorian Creech (Michael Daingerfield), and gave him his letter of resignation with the some threatening words written at the bottom. Before Shawn can congratulate Gus on his uncharacteristic assertiveness, Gus drops a bomb. Gus explains that he later returned to the office to withdraw his resignation, and found Creech stabbed to death in his office, clutching the note Gus had written to him earlier. Gus explains that he panicked, grabbed the note from Creech's dead hands and ate it. But then he started to choke on it, and things got out of control. Gus explains that he accidentally contaminated the crime scene and made it look like he was the one who killed Creech. Shawn instructs Gus to calm down and that they will head to the office and have a look.

At the office, Shawn sees the damage and is instantly worried; it's worse than he thought it was going to be. They both start to panic, one thing leads to another and Shawn ends up with a bloody nose. He sneezes, getting blood all over the already tainted crime scene. Now they are faced with having to clean up the whole crime scene or risk being arrested for Creech's murder. They do so, then decide to enlist the help of Henry.

The next morning, Creech's office has been cordoned off as a crime scene. The security guard at Central Coast Pharmaceuticals, Leslie Sally (David Koechner), tells Lassiter that he himself is going to head up part of the investigation. Sally discovers a lead that takes them to the parking garage. There, they find a piece of evidence – a coffee thermos Shawn brought from Juliet's house and accidentally left there the night before. Since Juliet's fingerprints are on the mug, Shawn knows that he has to tell her the truth about what's going on so she doesn't get investigated for Creech's murder either. Juliet is beyond peeved, but she agrees to slow down the testing at the lab while Shawn and Gus find the real killer.

The following day, the office has gathered for a memorial. There, we meet the Senior VP from headquarters, Mitch Murray (Michael McGlone), Finch (Zahf Paroo), Creech's biggest kiss-butt employee, and Neil Nebersol (Byron Noble), a disgruntled employee who says he fantasized about killing Creech every day. Next, Shawn and Gus get a call from Woody saying that he found some incriminating evidence on the body – the smell of cocoa butter lotion and Axe body spray. Woody knows that Gus wears cocoa butter lotion and that Shawn wears Axe body spray, so he asks the boys to explain themselves. Shawn and Gus reassure Woody that they didn't kill Creech, but Woody admits he is terrible at keeping secrets, and allows them to tie him up at the Psych office until they have found the real killer.