This is uncomfortable to watch.

Boeing released this video yesterday of the crew of a 787-9 Dreamliner rehearsing for the 2015 Paris Air Show next week.

The Vietnam Airlines plane starts to take off and then suddenly jerks upward so the angle goes from a normal "this is what planes are supposed to do" level to "holy shit is this a rocket?" degrees.

Something about it made me involuntarily look around to see if the other passengers were freaking out.

Sources: Boeing