Emailing back password in plain text - hey this is the password you've just set, don't forget it! I've only had it happen to me about 4 or 5 times in the past

Emailing back password in plain text - hey this is the password you've just set, don't forget it! I've only had it happen to me about 4 or 5 times in the past 15 years or so. But it makes me so disappointed each time that I literally want to find that developer and knock him/her out with the ugliest hammer I can find.