Occasionally when I tell people that my major is Computer Science they think I can help them with some problem on their computer. Just because I know how to make software doesn't mean I know how to operate arbitrary programs.
This is a conversation I recently had with someone that inspired this comic:
Girl: "Oh, so would you be able to fix my computer?"
Me: "Likely not."
Girl: "Well, can you hack?"
Girl: "Then you're useless to me."