Sweet and Salty

The following is based on a true story.
Chaim the Customer: Shaya, do you have any sugar in stock?
Shaya the Shopkeeper: Sure, and it’s on sale today!
Chaim: Sweet! I’d like 5 pounds, please.
Shaya measures the sugar, pours it into a bag, and hands it to Chaim. Chaim returns home, fills all his sugar shakers, and begins to prepare an elaborate array of desserts. That Shabbos, during the Kiddush, guests begin to gag and cough. “Oh! What’s wrong with this cake?” Many guests echo the sentiment. Chaim tries a dessert and gags, too. The desserts are extremely salty. Realizing that the shopkeeper sold him salt instead of sugar, his blood begins to boil into caramel.
Livid, Chaim returns to the store on Sunday. “Shaya, it wasn’t sugar that you sold me, it was ‘assault’! I’m liable to be sued by my guests.”
Shaya: Please forgive me. Even though I’m usually above the salt, mistakes happen. Here is a 5-pound bag of sugar. Keep the salt; it’s on the house.