What husbandry mistakes irritate you the most?

[Lychee]

I know I'm being kind of big headed, since I was taught how to take care of Bp's long before I had my own, but there are some husbandry mistakes that just irritate the heck out of me. What gets on my nerves the most is when people don't know anything about the proper temp and humidity levels for their specific pet. I mean, is it too much to ask that people do a few minutes of research (that could potentially save them from HUNDREDS of dollars in vet bills)? Grrrr >:P