One I know off;
A Bell47 3B1 has just had many new bits put on it, is test flown and signed off.
A pilot takes it out on a job, and somewhere between 25 and 30 minutes later he lands at a neighbouring property into a tight hole, ends up going down much faster than is acceptable, clips a pole with a M/R and we send the truck out next day.
The pilot is advised to stay well clear of the boss, and the engineers for quite some time.
But then I know of a certain Bell G5 that flew unscathed for 22,000 hours (all mustering) before being dunked in seawater. overpitched.
cheers tet