Im not so sure about the "custard pie fight" bit. It actually broadens your scope a little as a songwriter. No one is trying to one up the other, just to add to it. Maybe a custard pie pyramid building contest. Michael A raises a good point. (at least I think what he's trying to say is) It's hard to do this with people who you don't know pretty well. You have to have a mutual respect for all involved and check you ego at the door.