This is probably something that won't show up in most games, but if you select a group of tokens and then hold 'E' to rotate it, you can spin it around a few times and end up spinning it completely off the map. It only happens in the constrained rotation, holding alt-E will not cause it to do this. I can actually think of a few things you could do with this, if you were playing a really weird game about planetary physics... =D Anyway, figured someone should know. =D