Computational humor is a branch of computational linguistics and artificial intelligence which uses computers in humor research. It is a relatively new area, with the first dedicated conference organized in 1996.The two young people, who used the system over a ten-week period, regaled their peers, staff, family and neighbors with jokes such as: 'What do you call a spicy missile? A hot shot!' Their joy and enthusiasm at entertaining others was inspirational. Computational humor is a branch of computational linguistics and artificial intelligence which uses computers in humor research. It is a relatively new area, with the first dedicated conference organized in 1996. The first 'computer model of a sense of humor' was suggested bySuslov as early as 1992. Investigation of the general scheme of information processing shows the possibility of a specific malfunction, conditioned by the necessity of a quick deletion from consciousness of a false version. This specific malfunction can be identified with a humorous effect on psychological grounds: it exactly corresponds to incongruity-resolution theory. However, an essentially new ingredient, the role of timing, is added to the well-known role of ambiguity. In biological systems, a sense of humor inevitably develops in the course of evolution, because its biological function consists of quickening the transmission of the processed information into consciousness and in a more effective use of brain resources. A realization of this algorithm in neural networks justifies naturally Spencer's hypothesis on the mechanism of laughter: deletion of a false version corresponds to zeroing of some part of the neural network and excessive energy of neurons is thrown out to the motor cortex, arousing muscular contractions. A practical realization of this algorithm needs extensive databases, whose creation in the automatic regime was suggested recently. As a result, this magistral direction was not developed properly and subsequent investigations accepted somewhat specialized colouring.