I found this game on SMBZ forum (back when it was active). Here's how you play it:
Person 1 askes a question in "What would happen if" style (you'll see my question as an example).
Person 2 answers on that question in a funny or in a serious way (even though we know which one is more fun to play with ;) ), and then askes a new question.
Use the most of your imagination! :D
Time for question one! Since I'm the one who started the game, I'll do the honor xD :
What would happen if Apple opened a bakery? (like iPwns and iSmacks weren't enough...)