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
It's time for a NEW SCENE. The new scene is: We're on a boat hunting an oversized killer great white shark (which is illegal now because they're endagered, but we're ignoring that).
I'll start with F:
"Farewell and adieu to ye fair Spanish ladies; Farewell and adieu to ye ladies of Spain, For we've received order for to sail back to Boston, And so nevermore shall we see ye again."
RAGE! *Blows up pokemonfire out of pure rage with a block of wood* You're not a pokemon! What is a pokemon? It must be a very annoying little creature in order to be you! (Just joking. No offense. Need to keep story going.)