There are lots of things that contribute to enjoyable work. Giving people the feeling their time isn't worth anything is probably the best deterrent. Stuff like

There are lots of things that contribute to enjoyable work. Giving people the feeling their time isn't worth anything is probably the best deterrent. Stuff like: being late to pick people up; having them show if there is nothing to do and have them sit and wait for 8 hours doing absolutely nothing; similarly, having people sit and wait after the work is done (Extra points if they also act as if they did you a huge favor!); shit tools and materials requiring a lot of extra work every day to save 10 euro; insufficient time to do a decent job; treating any kind of communication as disruptive. In a call center you give people 30 sec to 2 min to recover after a bunch of calls. If you take that specific moment to complaint people don't know how fast to gtfo.