Usually when you see that familiar red card from Royal Mail on the doormat, it means your parcel is at a nearby office waiting to be picked up from you.
But one man had an altogether more amusing experience when he got home to find two cards on the mat explaining an unfortunate incident.
See also: Could Amazon be delivering by parachute soon?
See also: Why has local postie refused to deliver to this cul-de-sac?
Sam Cooke shared three photographs on Twitter which tell the story of how things unfolded.
Well this has happened today... pic.twitter.com/p1tPfGobif— Sam Cooke (@SJCooke94) 30 March 2017
The first is an image of a Royal Mail card, on which a note is written explaining that the parcel was 'put through window'.
So far, so normal.
But the next photograph is another Royal Mail card with a more amusing note: "I'm really sorry I think your parcel might have fallen in the toilet accidentally."
Sure enough, the third photograph is Sam's bathroom - complete with an open window and a parcel in the toilet.
Have you ever had a bad delivery experience? Share it with us by e-mailing email@example.com.
You can only imagine the horror of this particular postal worker when the parcel left their hand.
Luckily enough, Sam later revealed that the box - containing printer ink - was too wide to hit the water so it wasn't damaged.
Sam's tweet has had nearly 2,000 retweets from amused social media users.
Mirror Online has contacted Royal Mail for comment.