The game is very similar to this except it's impossible to do it all in 90 seconds here.
Rules are simple: starting person makes a scenario and starts a sentence with a letter. The next person starts another sentence with the next letter, the person after that does the same and so on. When we eventually reach the starting letter, the person who hit that letter creates a new scenario, picks a new letter, and it starts over.
Example: (starting letter = B, scenario = the office building's on fire) Person 1: "Bring me this month's financial reports." Person 2: "Can't you see the building's on fire?" Person 3: "Does it matter?" Person 4: "Everyone else is evacuating."
Ok now it starts Scenario = You're on the Titanic when it crashes into the iceberg; Starting letter = J
Just wait a moment. I just realised something. Maybe we're actually on a sleeping Stone Giant and not a mountain at all. And these giants don't like people walking all over them, especially if they remove some crystals. *ground starts to shake*
Nice plan. *stabs sword into ground* You might wonder what I'm doing, but that is this: *slides with sword in ground down mountain* You should try this!
Okay, I am so not doing that. I don't want to damage my precious twin katanas. Instead, I use this teleportation scroll to take us and the caravan down the stone giant. *Opens up scroll causing us to vanish* *Reappears at the foot of the stone giant*