What's the proper golf etiquette in the following situations?

1.You walk up to the tee, line up your shot and swing. The balls still sitting on the tee. You wiffed
2. Your opponent walks up to the tee, swings, and drives the tee three times as far as the ball. He hit that far under the ball.
3. Your partner hits a nice layup approach shot to allow for a water hazard. You miss hit the ball off the tee, it skims over the cart bridge crossing the water hazard. and rolls up to the green.
Do you laugh? These shots actually happened the other night. What’s proper?