1 Oh man, there was a rig like this at Bell Helicopter too with an Osprey hull in it. It never broke while I was there, but man, did I love walking through the materials test lab with all the 'thumpa-thumpa-thumpa' gong on.

2 Saw that one.  There's also a break fail test of landing system (full power take off and full break on).  It TOTALLY destroyed the tires, but it works.  https://www.youtube.com/watch?v=Mr4V680UQ-k
Sometimes I wonder if Boeing engineers are regretting never doing the wing break test on 787, now that they're finding cracks on the, in addition to the battery problem.

3

You guys are all missing the point.

4 I'd seen the video before, but didn't notice the cookie.

5 Two thoughts:

1) If I ever see a wing deflect like that on a plane I'm flying in, I do believe my bladder is going to spontaneously void itself through every pore of my body.

2) Clearly, the rubber duckie caused the break.

6 I assumed the duck had lent its strength to the wing...I defer to the expert though.

7 You kidding?  The DUCK caused the deflection!

8 They can get testy when you don't give them any grapes.  

9 There are rubber duckies all over the place at Boeing.  Seriously.  Well, not on the factory floor, but in the offices.

The cracks are not "OMG, We're all gonna die!" but you can't ship a plane like that. Basically about 40 sets came out of Mitsubishi with a manufacturing change that wasn't a good one.  It essentially resulted in no shims being in a joint that needs them, and when assembled that can cause some hairline cracks.  The joint can be fixed and the cracked part replaced easily enough, but it will be a pain in the ass for those poor in-tank guys.  None of the affected planes have been delivered.

The stated reason for not breaking the 787 wing when they tested it was they didn't want carbon fiber bits going everywhere, but also, it reached 150% of the maximum possible load and hadn't broken.  That was the test.  I think they actually went to 152%.  Basically the test is for a condition that is impossible on Earth.

The wing does flex more than other wings in the air, which makes the ride smoother, among other things.