Is this still happening? If so, i've got an un-serious idea:
Each team has to plant their own crops (ones from in-game but in real life) and they have to sit and watch them grow. The first team to get bored enough to stop watching and do something else will loose
The J Mod Community Challenge is being closed for now. We're still very keen on bringing you loads of fun community content, but this current plan needs to go back to the drawing board for the time being.