Long before Ancient Aliens contributor Giorgio A. Tsoukalos attributed every mystery in human history to extraterrestrials, TV's biggest proponent of aliens was Special Agent Fox Mulder (David Duchovny) from the original run of The X-Files.

FOX's hit series featured FBI agents putting aside cases involving drug cartels and crime syndicates so that they could focus on issues that really mattered: chasing ghosts, monsters and - on one occasion - killer trees. (And that was long before Mark Wahlberg's infamous heart-to-heart with murderous plants in The Happening.)

There was no shortage of strange moments on "The X-Files." But one incident stood out because it was surprisingly normal for the show. In the Season 6 episode Terms of Endearment, Special Agent Dana Scully - Mulder's skeptical partner - screens an FBI job applicant. And not just any bland applicant but a pothead caricature named Mr. Ginsberg (very subtle). The situation gets tense when Ginsberg is grilled about cannabis by Scully - played by Gillian Anderson, who turns 48 today.

Here's how the screening went according to a transcript published by a fan site called Inside the X.

SCULLY: (reading) "Did you, or have you ever smoked marijuana?"

(MR GINSBERG looks like Jerry Garcia. Total Hippie. The man knows his way around a joint.)

Mr GINSBERG: Nope. No, siree.

(SCULLY just stares at him for a moment.)

SCULLY: (reading) "Have you consorted with people who have now or in the past?"

MR GINSBERG: (thinking carefully) No...I really don't think so.

Luckily, Scully is spared from playing the workplace drug enforcer for the rest of the episode when a phone call interrupts the grilling. Mulder has stumbled upon a devil impersonating a man (played by notorious B-movie star Bruce Campbell) who is snatching unborn children in a twist on the plot from Rosemary's Baby.

Or as Mulder puts it, "Scully, this is a classic case of demon fetal harvest."

So thanks to Campbell, Mr. Ginsberg was presumably able to infiltrate the FBI on behalf of his pro-marijuana comrades.

Unfortunately, we couldn't find a clip from the episode online. But you can watch this sketch featuring Anderson and Duchovny reprising their "X-Files" roles as Jimmy Kimmel tries to catch them up on what's changed since the 1990s.

Banner image: Gillian Anderson and David Duchovny speaking at the 2013 San Diego Comic Con International, for "The X-Files" 20th Anniversary panel, at the San Diego Convention Center in San Diego, California. (Gage Skidmore / Flickr.com)