A joke

Uff! it's an old joke but it's good..
Doctor: Does it hurt when you do this?
Patient: Yes.
Doctor: Well, don't do that.
Doctor: Does it hurt when you do this?
Patient: Yes.
Doctor: Well, don't do that.
https://noticeboards.netlanguages.com/phpBB3/
https://noticeboards.netlanguages.com/phpBB3/viewtopic.php?f=6&t=195