Back in the prehistoric internet days I wandered into the text-only MOO called LambdaMOO. All went well for the first few minutes until I moved into the kitchen. "Hi there!" said a friendly resident. Then he put me in the microwave and cooked me.
Strangely enough, I have never participated in a MMPORG since then.
(picture is K.K. Slider from Animal Crossing: A friendly game where no one would EVER try to cook you. Though they may plant a pitfall in front of your door.)