Hanzo's ultimate ends up destroying Junkrat's RIP-Tire. Sometimes luck can be just as important in Overwatch, and Hanzo was definitely not aiming for Junkrat's tire. During a match on Temple of Anubis, Hanzo was behind a wall on the second point, climbing up and down, and firing shots at the enemy team.
He then decided to fire his Dragonstrike right onto the point. Immediately, the kill feed pings, but there wasn't an enemy player in the feed, instead, it was Junkrat's tire.
Redditor GoldenEye1108 posted the spectacular clip, but I wouldn't try this at home. The actual arrow of the ultimate has to hit the tire before it disappears into the dragon form. It only lasts a certain amount of time before it's gone, so you have a couple second window, to destroy objects like a RIP-Tire.
Just aim for the enemy team or chokepoints and you should do well.