@regehr Reminds me of this story from college, working on an E.E. problem set or something with a buddy.

Me: Did you get the answer to #2?
Buddy: Sure, it was pretty easy, take a look.
Me: <checks buddy’s work> Uh, you made a mistake integrating by parts here… and over here you divided by zero…
Buddy: <looks over his work confusedly> Oh yeah, you’re right. Maybe I shouldn’t have gotten high before working on it this morning.

Story #372 from “What I learned in college”