1: Find someone to force feed
2: Start force feeding them
3: While in the animation open your inventory
4: Before animation ends drop your piece of clothing which holds the piece of food.
5: Wait for animation to end, then the person you force fed becomes more enrgized.
6: Equip your piece of clothing back up
7: Now you have given your friend food and still have the food.
The result is a duplication bug.