Laughing at other peoples mistakes is human nature.
The company I work for is also an independent ISP (Internet Service provider) I've honestly lost count of the amount of times people have inadvertently ceased their Broadband for two reasons:
1. Not bothering to spend a couple of hours to find out what the line is and what's on it.
2. (My favourite) Thinking they're clever and can save a few quid by cancelling a landmine.