when you are solving a work related problem for someone and a conversation happens something like this
Person : while i have your attention, my mothers best friends brother in law has a problem with their computer , when they are on the internet and click on videos it doesn't work"
you: "are there any error messages?"
Person; Im not sure, he said it wont play
You: "do you know what operating system he has?"
Person: "no but it says compaq on it"
You: "im guessing its windows then..."
Person: " DON'T YOU KNOW WHATS WRONG? I THOUGHT IT PEOPLE KNEW HOW TO FIX COMPUTERS"