I just cane up with this idea, and I think it will generate some humorous discussion. Imagine you are the character, object, or person depicted in your profile picture. Now take on their persona, and discuss the flowing topic. Coke? or Pepsi? And why? I'll go first "Well, the correct answer is a refreshing, and delicious Pepsi of course! And I'm not just saying that because they sponsor us. Besides, have you seem the women they advertise with? Helloooo Nurse!!" You may argue civil in character as well.