In the original Civilization, there was a signed integer bug that made Gandhi overly aggressive. Normally Gandhi's aggression level is a very low 1. If you are playing a democracy, your opponents' aggressions are reduced by 2.
But what should have been Gandhi's aggression level of -1 in that case was treated as 255, making him the most aggressive possible.
/via http://kotaku.com/why-gandhi-is-such-an-asshole-in-civilization-1653818245