This Head of Household competition is called "Thunderdome" and here's how it works:
In this competition you must simply be the first houseguest to post the phrase:
*claims HOH key*
5 times in a row, without interruption from your opponents.
This first houseguest to do this will become the new Head of Household.
Asterisks are not essential, but the phrase must be as stated.
Any questions?
