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Laughter is an expression or appearance of merriment or amusement. Laughter is a sound that can be heard. It may ensue (as a physiological reaction) from jokes, tickling and other stimuli. Inhaling nitrous oxide can also induce laughter; other drugs, such as cannabis, can also induce episodes of strong laughter. Strong laughter can sometimes bring an onset of tears or even moderate muscular pain as a physical response to the act. Laughter can also be a response to physical touch, such as tickling, or even to moderate pain such as pressure on the ulnar nerve ("funny bone").