Once upon a time, there was this kid that wanted to know about recursion. His father told him:

Son, once upon a time, there was this kid that wanted to know about recursion. His father told him:

Son, once upon a time, there was this kid that wanted to know about recursion. His father told him:

Son, once upon a time, there was this kid that wanted to know about recursion. His father told him:

Son, once upon a time, there was this kid that wanted to know about recursion. His father told him:

…

ok, now we’re five levels deep into recursion and also have 5 items (father+son stories) on the stack. Once a father decides to change the story to end it instead of recurse further, the stack will unwind and function at the top (this blog post), will end.