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Not feeling pain is a Bad Thing: it's there as a warning that you have sustained damage. If you don't feel the pain, then you don't treat the damage and it gets worse not better. That's why Lepers are supposed to lose fingers, toes and so forth. The disease doesn't make them drop off, it destroys the nerve endings which carry the pain signals so infection becomes a real problem. (About a hundred people a year are diagnosed with leprosy in the USA)
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
There are tons of examples still floating around that use the 2005 version of Adventureworks that don't work with the newer versions due to minor schema changes. I found one the other day where I had to spend an hour tinkering with the dmv/code to even get it to work.
Another time, following an example from a book, I got an unhandled exception when opening a print preview window, even though my code matched the book exactly. Handling/ignoring the error meant the print preview failed entirely. I spent days trying to figure it out, even posting the problem at the publisher's website before I changed my default printer and the error went away!