I know there's been at least one CSI that mentioned that sort of problem. In fact, it was mentioned that the shooter in question had clearly learned everything they knew about guns from TV/movies.

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Gillian

"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"

"You can't erase icing."

"I can't believe it doesn't work! I found it on the internet, man!"