My BMW currently has a bad rod. It's been going downhill for years, but it finally threw it a couple months ago. It makes a horrible knocking sound when it runs, probably the rod hitting the side of the block. Amazingly it still runs, though. /forums/images/graemlins/eek.gif
Say all you want about BMW's being yuppie cars, they're some of the best built vehicles ever. Come stock with a forged crank (probably the only thing keeping mine alive).
I've also seen my dad's built 327 chevy go. From what we can tell, it revved to high and a piston caught the bottom edge of a cylinder wall. Piston grenaded (biggest piece we found was about the size of a quarter) and the rod spun around taking out everything. The oil pan was hacked in half and the block had a huge chunk missing from it. It was pretty cool looking. You could see daylight straight through the middle of the block /forums/images/graemlins/blush.gif