Good excuse for not eating chocolate?

I recently got as a gift a big thing of chocolate. 400 grams, turns out to be a favourite brand of mine. Its made me break into a binge as for ages I had been off chocolate and trying to eat better (which I was doing superbly). Now there is this chocolate, a gift from some country, there is a lot of it and I can't refuse. I can't just subtly chuck it away. It has to be aten and nobody else wants some. I've eaten half already and its not good. Whats a legitimate excuse or some method I can do to evade the choc?