I hate the confusion that "do you mind" questions cause.
"Do you mind if I turn off the light?"
What is meant in response: "No (I don't mind)"
What's said instead: "Yes"
I feel like two people never really know how the other will interpret it, so you almost always have to say something like "yes, go ahead" or "no, I don't mind" (or "no, go ahead"). If they do respond just "yes" or "no", I feel like I have to ask for clarification.
Also can we get the meaning of "semi-" and "bi-" figured out? I generally love the oddities of evolving language so long as we can all still be understood, but these two always require clarification.
Bi-annual: Every two years.
Semi-annual: Twice a year