lol when I first read this I thought it said "that *suck at* their jobs". That didn't seem very enlightening!
I like this one except for the fact that diamonds are made from carbon (a nonmetallic element)....not coal (a sedimentary rock made from ancient plant remains)! Sorry, I'm an earth science teacher, so when it comes to minerals, I'm kinda picky!!! I did show it to my students, though. With my own disclaimer. ;)