I believe that's the joke. The barbarians intelligence isn't usually very high.

But the other party members haven't

"Is the guard that tells the truth standing in front of the safe door?" If they say yes, you go through their door, if they say no then you go to the other one

In fact, the lying guard is a red herring. You get one question, and need one piece of info: the door. The canonical question doesn't tell you which guard lies, nor do you care to find out.

The riddle only makes sense as such with one question in total. The trick is to ask one guard what the other guard would say is behind a particular door.

The riddle is worded vaguely and we just murdered one of the guys. I think we can lawyer another question out of them.

Start b-ballin' with that head and see how long it takes that guard to change his tune

Pyramids of Mars

Do you think it would suck to be one of the bottom heads?

I mean, he could still lie. He'd just have to afford one more question

The third guard stabs people who ask tricky questions.

My favorite take on this: 

Barbarian just ripped the head off of one of the guards, you think the other guard is going to be able to arrest them? "Answer our questions or you're next."

Just shoot em in the foot  https://www.giantitp.com/comics/oots0327.html

I love playing low Intelligence high *Wisdom* characters. Because Wisdom governs stats like Perception, Insight, and Animal Handling. So your character will *notice* things that the rest of the party misses, but often doesn’t have the intelligence to put the individual pieces together. Once played a high wisdom barbarian. He would notice things like traps or clues, but I would RP it with things like “Hey, why’s that wire stretched across the path? Someone is going to trip over that…” The other players very quickly learned to pay attention whenever I asked stupid questions, because it was *usually* my way of announcing “I noticed something that the rest of you missed.”

That's wild that this works. What.

Yes, thank you!! Found the scene itself since the whole serial is apparently on youtube: https://youtu.be/lLBHbt9QYFU?t=5458 Funny how my memory had it in black and white. And I remember the scene being much longer. I watched it when I was like, 9.

I did not think this was going to work. Som bitch it does. Crazy

That is why it is better for the barbarian to snap the wrist of the one guard, so that you can ask them a question still or you ask the first guard which way to the castle then rip his head off followed by asking the second guard if the first guard is dead. You will get the question from each guard and know which one tells the truth.

I could swear this was a bit from the video game High On Life, unless they recycled the bit for Rick and Morty. I haven't seen all the episodes.