According to the provisions of Article 264 of the Criminal Law, theft refers to the act of secretly stealing a large amount of public or private property for the purpose of illegal possession, or repeatedly stealing, burglary, theft with a weapon, and pickpocketing public or private property.

Throw a classmate's cup:

It doesn't belong to theft, it can only be counted as bad morality. The school has no right to punish you, Cup 10 yuan, never mind.