ComedySportz of Chicago
Where in normal A-Z you must start each sentence with consecutive letters, here you have three people, one of whom is not constrained.
Players A and B must follow the alphabet, and C can say whatever she/he pleases.
A: Alright, who let the tiger out?
B: But it was your turn to feed him!
A: Couldn't you just let me give him his Lion Chow?
B: Darn, you should have thought about that…
C: Look guys, the lion went into the mall!
A: Now look what you've done!
B: Oh, I hadn't thought about that!
A: Perhaps we should bring a leash.
B: Quizno's has some fat people working there so maybe he went there.
A: Rick, grab the trap and the coupons!
C: Why in the world would you want coupons?
A: Didn't have any lunch and want to keep my strength up to catch lions.
B: Even I remembered to eat something before I came.
An actual scene must develop, with the random C changing the pattern of the alphabet. The other players must remember the scene, then, as well as the letters.