Bad thinking habits:

Treating one's thinking as infallible
Believing one's emotions accurately reflect reality
Speculation, interpretation, generalisation, and extrapolation based on insufficient data
Believing one can accurately discern the future
Believing one can accurately discern other people's beliefs, thoughts, and feelings
Filtering out or discounting the positive or the neutral
Deliberately hunting for, manufacturing, and magnifying the negative
Black-and-white thinking
Simplistic thinking
Belief in signs
Taking things personally
Gathering evidence to support a conclusion already drawn