Not visible from this picture so it might not fit your post. But the hydraulic cylinder on the ground shattered while retracted. the metal bits prevented movement and our log cutter popped a hose spraying me with hydraulic fluid one fall.

the “aha there’s your problem” moment didn’t arrive until we got the rest of the hoses disconnected from it and let it drain and found out it still wouldn’t move. it was my first time tearing a machine down that far so the pictures aren’t great but it was a fun moment for me. not so much my boss.