So I tried to sell .1 BTC at a rate of $1/btc ($0.10 total). The system forced me to sell at the lowest offer, not what I specified.
That means something other than a customer mistake was made in the system.
I was really hoping to screw with some people too....

EDIT: No, I wasn't the person that did the $2.99 trade. You can't do that from what I explained above anyway. Give it a try if you want. You will see the same thing.
I just tried your experiment and the order went through. That's the way I would expect it to work. Is there something wrong with that? Wait... did you just trick me into selling 0.1 btc for a $0.10?