Something Weird happened at 35,000 feet

[Sky727]

A United Airlines Boeing 737-800 series was cruising at FL350 when something struck the aircraft's right windscreen.  The report did not say if they lost pressurization however the flight did declare an emergency and made a rapid decent to a lower altitude. The impact was hard enough to possibly bend the window frame and spider crack the windshield.  "What to heck was that?" 

[Unknownparadox]

A United Airlines Boeing 737-800 series was cruising at FL350 when something struck the aircraft's right windscreen.  The report did not say if they lost pressurization however the flight did declare an emergency and made a rapid decent to a lower altitude. The impact was hard enough to possibly bend the window frame and spider crack the windshield.  "What to heck was that?" 
[Video: https://youtu.be/mlgR60onFXU]

I think the current claim is this

WindBorne, a California start-up focused on advanced weather forecasting and atmospheric data collection, said in a statement Monday it believes one of its balloons likely hit the plane.
https://www.accuweather.com/en/travel/un...ys/1827737

[Kurokage]

I do know certain Geese can fly around that height, as the Bar-headed Goose is known to fly over the Himalayas, but I imagine it's very rare.  Still, very weird and must of been terrifying for the pilots.