一个特别喜爱昆虫的人做了这样一个实验：
他将跳蚤放进敞口的瓶子里，它立刻便跳了出来。当把瓶子盖上时，跳蚤还是会竭力跳出瓶子，它不停地撞击着瓶盖的内侧。一个多小时后，他还在那样跳着。
差不多三个小时后，它依然在跳，只是它不再撞着瓶盖了，此时它跳的高度离瓶盖大约1厘米左右，而且每一次都是如此。
这时，瓶盖被拿掉了，但是跳蚤并没有跳出瓶口，它依然保持着有瓶盖时的高度，再也跳不出瓶口。
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