Have you ever made a mountain out of a mole hill? Tried to predict a catastrophe based on a relatively small problem? Generalized your complete and innate awfulness based on one minor flaw or failure? Thought in terms of "I must...!" or "You should...!" or "They have to...!"?
Rational-Emotive Behavior Therapy (REBT) is a type of therapy that challenges irrational thoughts (and the resultant out of control emotions), and replaces them with thoughts and feelings that are more closely aligned with reality and truth.