I got to participate in this as a player once. We had been playing RPGs all day and night and now it was the wee hours of the morning and some of the fellows had passed out already. A few of us too tired to really play anything proper basically just did a group narrative play- no dice and the DM/narrator said yes to everything. It was fun for about 15 min and then slogged on for another 15 because there was no challenge, risk or anything that really drove the story forward. Our characters were heroes of the day, but it felt hollow.
I compare this to a game when the GM never said "No" and le the dice fall where they may instead. The dice were on our side and on this little one shot we succeeded on every roll that was called for. It generated its own form of hilarity and fun and while it may seem that this was the same as the experience above, it was far better if only for the 'Risk' of failure that was present.
I also participated in a game like this once, though I’d say it worked out much better for us.
Similar story, late night didn’t really want to start up anything else so the gm ran with an idea he had. We were a trio of intergalactic secret agents sent to earth to retrieve a runaway scientist and a prototype device he had come up with that would change the galaxy. He gave us a choice for our character archetype, we could choose our specialty brains, brawn or stealth. He followed our choices up with some secret information for each of us about where our true allegiances lay, we weren’t all exactly working together as much as it seemed.
We started play searching for the scientist, playing up some in jokes about our hometown and the late night haunts. The brains player asked if he could use his brains to reprogram vehicles/cameras to work for them, gm answers yes.
Various little things like this go on for a bit, stealth goes off to hunt for clues solo. The other return to their hotel room/base of operations to rest and monitor cameras.
Brawn gets a secret communication informing him that at least one of the team is working for the enemy. He immediately declares he shoots brains, gm says yes brains is filled with lead and drops. Brains asks if he can get a shot off as he’s dieing, yes. Disintegration ray takes out the lower half of brawn’s body.
You might think game over here but the gm reacts and has a trauma team show up and Brawn gets a cyborg lower torso replacement. Brains is revealed to have always been controlled by a robot brain and he’s been uploaded into another body.
The game continued much this way for a couple of hours ending up stealth in a robotic spider body battling brawn while brains sent an army of killer robots against both. In the confusion the scientist escaped and our hometown became a barren wasteland.
The game worked because of the constrained situation we were in with characters with specific goals and the gms ability to roll with the flow and adjust the situation with a new setup that still made sense even though we’d completely changed things.
I think the antagonism amongst the characters may have helped somewhat as we played in a similar manner a few times where it didn’t quite work as well. More petered out without resolution.