It would appear that ‘Knock Knock’ is one of those stories that doesn’t quite fit into literary categories. It’s most recent Rejection Note runs:

Dear Edoardo:

Thank you so much for submitting “Knock Knock” for our consideration, and for your interest in […]. We apologize for the delay in responding to your submission, and we are taking steps to improve our response time.

We are going to pass on this particular effort, but I hope we shall see more stories from you in the future. It’s a good story, but not the right fit for us.

Good luck in your ongoing endeavors.

Warmly,

Compare to Rejection Note no.9:

Dear Edoardo Albert:

Thank you for sending us “Knock Knock”. We really enjoyed this piece, but we didn’t feel it was right for […].

We hope that you will continue to send us your work.

Sincerely,

The Editors