Marshall: So what do you mean "it wasn't a date"?
Ted: She thought we were seeing a movie just as friends.
Marshall: Why would she think that?
Robin: Did she see your tattoo and assume you were gay?
Ted: Apparently, there's a rule that says can't date Stella.
Barney: Exactly, the platinum rule. Stella reads my blog.
Ted: No, this rule comes from the American Medical Association. Doctors aren't legally allowed to date their patients.