Yesterday we came across a very 'rare' situation in Arkham Horror. We had been lucky with getting one Elder Sign via setup (random possession) and managed to buy another 2 within the first few turns of the game.
Due to some fortunate Mythos cards, not many gates opened on the first few turns (monster surges or blocked by Kates ability) and so we managed to seal two gates using the Elder signs, resulting in 0 doom tracker tokens on the Great Old One (GOO).
What would happen should we seal another gate with the Elder Sign and no doom tracker tokens were available to take from the GOO?