I'm eager to know whether there is any fixed expression in English to refuse answering the WH-question "why" when you are reluctant or somehow have some reasons that prevents you from answering.
I have heard the following sentences from non-native speakers from different countries. (Some of them used to teach English for a long time.)
......., but why?
a. Because the sky is high!
b. Because elephant can't fly!
c. Because I like apple pie!
Note: please consider the rythmic manner of each case compared to "why".
It is obvious that they are sort of humorous or even perhaps childish ways of replying to the question "why?".
In addition to that, if you google each case above, you'll immediately find out that there is no reliable source for them on the internet. Also, it is visible that a large proportion of the results seem to relate to the Arab world, Kurdistan or Turkey, Iran and Russia and some countries in Eastern Europe. That was why I decided to make sure whether they are widespread in English, or they are improvisations of other languages.
I have always used "just because" in this case prior to this. However I would appreciate if you do me a favor and make me aware in this case.
PS. I need AmE equivalents if they do not work in American English.