The Backwards Wristwatch is a mysterious and eerie timepiece that, due to apparently being either possessed or cursed, causes whoever wears it to do everything backwards, without even noticing anything is wrong with them.
In The Super Mario Bros. Super Show! episode "Time Out Luigi", after several failed sales attempts, Angelica, "Mysterious Salesperson for Weird and Spooky Gadgets Incorporated", decided to try and sell Luigi the Backwards Wristwatch for ten dollars. After some bantering, in which the price of the Backwards Wristwatch went from five to seven dollars, Luigi finally succeeded in buying the Backwards Wristwatch from Angelica for four dollars. With the Backwards Wristwatch now his, Luigi began to brag to Mario about how much a bargain it was, only for Mario to respond by saying of course it was a bargain, as the wristwatch was broken, because it runs backwards.
Regardless of it's imperfection, Luigi decided to wear the Backwards Wristwatch, which subsequently made Luigi do everything backwards, without him realizing it. It was only after Luigi fell asleep on the couch after a backwards jog that Mario decided to try and remove the Backwards Wristwatch from Luigi's wrist. Mario's attempt at doing this failed though, the watch having electrocuted him and caused the lights of Mario Brothers Plumbing to go out.
The Backwards Wristwatch was eventually removed from Luigi's wrist by Angelica, who Mario had called and was forced to give ten dollars to for her services. In order to remove the Backwards Wristwatch from Luigi, Angelica tells him not to give her the wristwatch, which caused Luigi to instantly take the wristwatch off and give it to Angelica.