I'll prove you with a Certificate!!!
proof /pruːf/ noun 1. evidence or argument establishing a fact or the truth of a statement. certificate / səˈtɪfɪkət/ noun 1. an official document attesting a fact, in particular. 2. a document recording a person's birth, marriage, or death. 3. a document confirming that someone has reached a certain level of achievement in a course of study or training. Source - Google Hungry Boy : I am hungry. I need food to eat. Waiter : Show me the certificate, Sir! Hungry Boy : Why? I a...