You approach the altar with a mocking expression upon your face.  You have not come to give him anything; you've come to desecrate the temple of this pathetic god.  Just as your about to knock over a rather large statue, you hear something.  Spinning to see who it is, you spot Ares glaring at you.
"What are you doing?" he questions.  "Are you here to give me something?'
"I don't want to give anything to you, you arrogant bastard!" you scream.  He cocks an eyebrow at you and then strikes you with a rather powerful lightning bolt, which knocks you unconscious.  When you wake up, you decide never to come back.