Similar to IamBrutus' story:
We're playing a company outing, we were both college guys, and both hackers more interested in getting drunk than playing golf. We had a large cooler on the floor of the cart, holding at least a case of beer and ice. We teed off at 8:00 in the morning, so the course was still very wet with dew. On the second or third hole, we come over this ridge and there's a steady, tree-lined downhill fairway that runs 150-200 yards (still very much in the shade). My buddy decides it's a good run downhill until we hit top speed then hammer the brakes and crank off the wheel. We spun and fast. We both go flying out of the cart, the cooler goes flying and the cart goes spinning down the hill. We end up picking up all the beer, as much ice as possible and chase down the cart. We didn't say anything about it until afterward when the company president (playing 2 groups behind us) asked if anyone knew anything about all the ice scattered everywhere and the weird tire patterns in the fairway.
Similar to ScaletBlood31's:
I was playing with my wife, her sister and her husband. I teed off and out-drove the slight dogleg and ended up in some trees. It was a par 5 and I was still 250ish from the green. It wasn't a dense wood, so I decide to hit a low 3 iron out. I crush it straight toward the green, as well as a 4" diameter tree. It hits perfectly square and comes right back at me. It flew past me no further than 2 feet to my right and ends up 40-50 yards behind where it started. I turn around and walk back to where it now lies, thinking "I'm gonna do the same thing. No way that shit happens again, right?" Wrong. I hit the sam f-ing tree and lost almost 100 yards on 2 straight shots.