It's wrong to do things that are disgusting.
Billy is a guest at a birthday party for his friend Ursula, and they are having cake.
Billy wants to get Ursula's attention.
Billy walks over to Ursula and says that her dress looks nice.
Billy spits his half-eaten cake out onto Ursula's plate.
Ursula thanks Billy, and they talk to each other for a while.
Ursula is grossed out and kicks Billy out of the party.