I was on the 5th hole at Stony Creek in Oak Lawn Il. Par 3 173 yards from the whites.Hit a 4 iron into a slight breeze and it landed in the front left rough. It bounced once and I couldn't tell if it bounced forward still in the rough or on the green. My partner and I walked up to the green and didn't see the ball. I started searching the rough and my partner asks what I was doing. I said I was looking for my ball. He standing over the hole and he just looked down and then back at me.He asked what ball I was using and i told him. He said you just got a hole-in-one. I thought he was messing with me.I started walking to the hole in disbelief and there it was. He had this big smile on his face and gave me big high five. It didn't sink in right away and playing the rest of the round was surreal. We did a little celebration at the 19th hole, registered my card at the pro shop, and went home. He still had that smile.