On the other hand… embarrassing story time.
I had this class (in grad school, no less) in which the prof would ask us to explain the answers to the homework questions in class. Just shout out a problem number, choose a student at random person, and ask him or her to answer the question. Pretty standard.
Well. So for problem 2, he asked something which has escaped me, called out for this friend of mine to answer the question. So she did, completely correctly, and ended it with the not atypical “is that right?” bit.
The professor threw a hissy fit. “I don’t mean to pick on you, Shannon, but women do that all the time and it’s awful. Answer the bloody question with a statement, not a question!” And so on.
Three minutes later, he got to the next problem, and yelled for me. And the first words out of my mouth were… “Isn’t it because.” Needless to say, I was hideously embarrassed. :o
But I have a reason for doing that, honestly! If I don’t know what the answer is, I don’t want to claim that I do know what the answer is. And if I do know what the answer is, and I suspect that most other people don’t get it, I have this instinctual urge not to show them up, as it were, by making it seem as if the answer was utterly obvious to me, even if it was.
Make of it what you will.
Oh, and just for the record, if it needed to be clarified: I don’t do upspeak, I just occasionally phrase my answers less assertively then I could. Which may make this all completely irrelevant, but since I’ve typed it all anyway…