1) Militant protesters storm the house and hold the housemates hostage, prompting the SAS to come in and clean it up, with acceptable losses.
2) Remote contrl hellicopters armed with light smg's make a murderous assault
3) The Baliffs / Police raid the house and cart the housemates off, inspite of C4's plea.
4) C4 do not medal, take advantage and play fair with the editing to make it a clean contest.
Sorry I had to add one in there with no basis that it will ever happen. 