Wife and I never get any alone time because we have too many kids. We were both finally home alone a few weeks ago so we we're going at it. Next thing I know I'm balls deep and I hear my mother in law's voice "HELLO???"
She says she knocked (we have a bell she didn't ring) and then let herself in the side door for some reason. Wife whipped on her clothes and ran downstairs before she could come up.
Nothing really came of it but when were alone one of us will jokingly say "Hello??" now