Download a trial copy of
Sublime Text and fill a few tabs with a ton of code (grab off pastebin). Maximize it and leave it on your screen. When asked, start explaining the code to them. Make shit up as you go along. They'll lose interest within 15 seconds.
If they still ask what it looks like on a computer, make them feel dumb by saying "it is the code that runs the backend, there is nothing to 'see.'" Be sure to mock them. They'll feel really dumb and give up.
Make it sound complicated and make them feel dumb.