No, that's the most inconvenience you can cause. There are worse things you can do: target specific people with spurious orders, cancel everything they order, or if you want add random items to every order, making the entire system useless.
people are underestimating the havoc this could create in a country like India. Imagine serving chicken at a table that is strictly vegetarian (many people in India are vegetarian due to religious reasons), will lead to a lot of outrage.
This could even be lethal if you are ordering something you know the target is allergic to...