Wasn't sure if I could create a thread or not, but I scrolled through and didn't see this game. What you do is, I'll start a topic, and everyone takes turns posting an answer beginning with the letter of the alphabet.
Example: Topic: Food
next post would be a B food and so forth.
The person who gets Z, chooses a new topic.
In the event the topic is people oriented the first or last name can start with the letter.
So, to get us started topic is: Movies
A: Adams Family