I got my first hole in one recently, at a local course in Eureka, Ca. It was a par 4 287 yard, ( markers said 298 but I measured it) with my 3 wood. The people near the green waiting for the next hole, were standing there when I teed off, and the ball was going near them, when the ball landed they turn there heads, and I thought oh crap I almost hit them. It turns out they heard it hit, and were surprised and just backed up a little bit. They said it hit a little rise a few yards past the green, on the slope, and caused the ball to roll backwards and in the hole!