title: real-life applications of stack
body: <p>I was trying to think of some non-CS related applications of the stack concept in the real life, unlike function calling, parsing, DFS, etc. but couldn't come up with any.
  For queues, I can think of several, e.g. assembly line in a factory, customer servicing in banks etc. but am not able to think of similar ones that work only via pushes &amp; pops in the non-CS part of our daily life. Can someone please suggest somethings?</p>