Tickling is touching a part of the body (any part will do), so as to cause involuntary twitching movements or laughter Laughter is an audible expression or appearance of happiness, or an inward feeling of joy . It may ensue (as a physiological reaction) from jokes, tickling, and other stimuli. Strong laughter can sometimes bring an onset of tears or even moderate muscular pain; however, it is in most cases a very pleasant sensation. Such sensations can be pleasurable Pleasure describes the broad class of mental states that humans and other animals experience as positive, enjoyable, or otherwise to be sought out. It thus includes more specific mental states such as happiness, entertainment, enjoyment, ecstasy, and euphoria. In psychology, the pleasure principle describes pleasure as a positive feedback or exciting, but are sometimes considered highly unpleasant, particularly in the case of relentless heavy tickling.
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