When it's ajar.
My sister took a while to get the joke because she doesn't know what ajar is and thought it was a literal question and not a riddle. And after that she giggled for ten minutes straight.
Now I'm treated to this repeated chorus everytime I come home.
Crazy kid.
And this reminds me of one of my fave lines from one of my fave books. Does anyone know what it is? I'll give you a cookie.
"Life is a journey. Time is a river. The door is ajar."
*off to reread the book*