It happens all the time. Someone asks "What's the system running on your computer?
Then, if I answer "OpenBSD" I get questions like "What is it?" "Why is it better?" "Why don't other people use it?" etc... and it's boring. Especially when it get to the kind of question "Convince me I should use it then".
I don't want to convince people to use it, they should do their own opinion about what they want and need.
Now I answer "I run something you don't want."