The lowest life forms I've ever encountered on Risk are Heath Casey (Novice) and WhiteMaori88 (Novice), especially the former. Both in the same game, in an automatch. Heath Casey offered me an alliance on not one but TWO occasions. only to proceed to attack me on the very next turn. The WhiteMaori also did the same, but at least broke the alliance with me first. On the second time Heath Casey sent me an alliance and attacked me, it was when my continent (N. America) had already been 'distrupted' by WhiteMaori88. She just wanted to reduce my troop numbers, even though I was already the weakest player of the three then. It was an obvious case of both of them teaming up to smash me. I don't know why they would think of teaming up against me. Is it because I'm an expert and they are novices?
I don't think they were the same person using two accounts, because it was an automatch. But what really makes me bloody pissed off is that they (especially Heath) would send me an alliance to trick me, and then IMMEDIATELY severely attack me the very next turn. That is the height of shameful, dishonest, pathetic behavior.
If any of you play against Heath Casey, be careful of her. Accept her alliance as a pretense, but guard yourselves against her, even more than against other players. Because if she sends you an alliance, it means she's going to try and smash you the very next turn. A real bitch.