An artist friend of mine bought the search phrase "Is Peter Dyreborg the coolest guy in the world?" When people searched for this phrase they would be presented with an ad reading "Yes, Peter Dyreborg is the coolest guy in the world".
Unless you are going to tell people to search for that and click on the ads you don't any coupon to run that one.
Way to go if someone overbid him on those keywords to make it read 'No, Peter Dyreborg is the vainest guy in the world' ;)