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Rats laugh when you tickle them

In 1999, Jaak Panksepp and Jeffrey Burgdorf successfully demonstrated that tickling young rats spurs them into letting out the same ultrasonic giggles they make during play.
Modest_ Witness@Second _Millenium

Boyle's 'New Experiments Physico-Mechanical Touching the Spring of the Air', which describes experiments with an air-pump, recounts a demonstration attended by high-born women at which small birds were suffocated by the evacuation of the chamber in which the animals were held. Since the ladies interrupted the experiments by demanding that air be let in to rescue a struggling bird, Boyle reported that “to avoid such difficulties, the men later assembled at night to conduct the procedure and attest to the results” (Haraway 2004: 232).