I've been re-reading Sherlock Homes recently, because it's good for my soul. I think most mystery writers are inspired by Holmes in the same way musicians are inspired by the Beatles.
Yes, I'm aware Conan Doyle was not the first mystery writer. Poe et al. got their blows in first, but try saying "Auguste Dupin" to a random stranger and see what blank reaction you get.
So my strange factoid of the day is this: at no point in the Canon does Holmes ever say, "You interest me strangely."
Which is a pity because it sounds like it should be there.
"You interest me strangely," said Holmes, leaning back in his chair. "Pray continue."
The biggest users of the phrase appear to be P.G. Wodehouse(!) and Sax Rohmer.