All you have to is when one person says. "<insert something here> or <insert something here>", one person answers then they continue using "<insert something here> or <insert something here>" and so on. Example:
Guy 1:
Mario or Sonic?
Guy 2:
Sonic.
Stay up late or go to bed?
Guy 3:
Go to bed.
New topic or add relpy?
(etc...)
Well let's start!
AOL or Internet Explorer?