After a while, a joke, if you say it too much, just becomes contrived, or fake-sounding.

After a while, a joke, if you say it too much, just becomes contrived, or fake-sounding.

过了一段时间，一个笑话，如果你说得太多，就会变得做作，或者听起来很假。

-- Dave Chappelle 大卫查普尔