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 kind of odd that we were on the Titanic and somehow M16s and robots with lazers exist, I guess we went thru a time warp while on our raft or something] "Move quickly everyone! On to the pirate ship! I'll have the robots defend us until we get there. This laptop isn't wireless, but the extension cord is just long enough to reach the ship."