I was trying to cut off a Zeke last night who was trying to high-tail it back to base to avoid the three or so friendlies closing on the field from the N (I was coming up from the SW, high-deflection) and right as I squeezed off some guy comes zipping in from the left and I end up blowing a big, gaping hole in my wing. No other damage, but still.
Also, I was clearing a friendly's six of an La-5 the other night. Friendly went into a zoom, the La followed, and I zoomed on the La. I fired and started peppering the La, when all the sudden the friendly dragging out the con for me decided he was going to immelmann over the top of the La. The La broke apart, but I couldn't see because he was super-imposed over the friendly I was clearing, and it was low-light conditions, so I continued to fire to make sure he was dead. All the sudden the friendly pops right back into my line of fire, about 400yds out. I only put a half-second of .50cal into him before I let up on the trigger, but that was STILL enough to knock out my engine.