Which is just the very long way of saying that I've seen a lot of Monkees episodes. Last night a thought occured to me: this is what most roleplaying sessions would look like if they happened in "real life".
While they never found the Underground Lair of Bonky the Absolutely Mad and engaged a rust monster of owlbear in mortal combat, they often went off in search of treasures and face bad guys.
Most RPG players, at one time or another, have their characters make in-game jokes, run around like idiots when they've lost the thread, or forced the Gamemaster bend the plot like a slinky to get they players back on track.
Encounter: Clearly Insane Person
The party runs across a lone individual who they quickly realize, has completely lost their mind. The person is the lone survivor of a previous party; a prisoner who hs been alone for a few decades; or in the case of the Monkees, an actor from a previous series who was left behind when the show wrapped.This person has some information vital to the Party, however they are now so crazy that they can barely speak. Instead they can only string together nonsense gibberish or random words. However, the party member with the LOWEST Intelligence score somehow easily understands the gibberish. The Player of the PC is allowed to freely interpret the nonsent as they see fit, but the Clearly Insane Person can vehimently indicate the negative if the GM thinks the player has gone to far.
To convey the needed information, the GM can either have the Clearly Insane Person remember how speak after a bit of practise, or write down the info and pass it to the translate PC.
The Clearly Insane Person however, always asks for something in return for their help. While they do not want to leave their current location, they will demand something that is particularly silly.