Let’s say it’s for something petty-ish. Like they grabbed the last mango at the supermarket that you had your eye on and were walking over to get it. Idk you’re the witch so you can choose your level of vindictiveness. Explain what they did if it’s fitting in with the curse.
If they took the last mango from me there going to drop anything mango related on the floor just before they take a bite for at least a few months. Going to have to lick there precious mangoy treats off the floor like a dog.