Make a mountain out of a molehill.
Expect a reaction that is not in the other individual's nature. Then...
Be disappointed or hurt that the desired outcome did not happen.
Dislike someone. Intensely.
Develop a tendency to take things personally.
Hold imaginary conversations where you predict what another person's reply will be. Go through every possible scenario.
Feed irrational fear.
Assume that things that appear to be larger than you are actually about you.
Decide that you can win by fighting things that seem larger than you. Thrash about.
Hold on tight, for as long as you can, to something that caused you pain.
When you're feeling paranoid, analyze every unrelated event until you find evidence, however small, that the world is indeed out to get you.
Complain. Make sure you make the complaints elliptical by finding people who have similar issues so that beyond discussing them action to resolve them is never taken.
Anticipate the worst-case scenario so you can feel stressed about things that are not likely to happen.