I once called my old high school physics tutor by phone. He was not that fluent in English. He needs to be appreciated by me because without him, mechanics would have been much difficult... Our conversation began and we spoke about some concepts, how life went on and so on...He was talking about his present students and at one point.. Tutor; Mechanics and electro-magnetics are difficult to understand... (He paused for a second)... Me(Without any intentions, innocently); For you, sir? Tutor;:surprised No no... For the (present) students.. And so our conversation continued..I think he took it lightly..With a flow, I asked him this awkward question, unknowingly. Have you faced such an awkward moment on phone?