Touching home in a time of 3:42.44, Sun held off a storming swim from Olympic champion Horton, who had failed to even qualify for the event at the Australian trials but was added to the squad as a discretionary pick.
Free Birds has a couple of laughs and if you don't think too much, you might not even find it predictable, writes Paloma Sharma.
"I have been on teams where people have failed a drug test, accidentally and through no fault of their own. I would never call them cheats. It seems to be very hypocritical."
Coming from the makers of The Conjuring, its spin-off Annabelle pales in comparison, says Paloma Sharma.
At the medal ceremony, Scott shook hands with fellow bronze medallist Martin Malyutin of Russia, who finished with the same time as the Briton, but then completely cold shouldered Sun, refusing to make eye contact and not offering a handshake.
Chinese Olympic women's swimmer Chen Xinyi tested positive for a banned substance at the Rio Olympics on August 7, state media said on Friday citing the country's swimming association, the latest doping scandal to mar competition at the Games.
Australia set a world record of 7:41.50 en route to winning the gold medal in the women's 4x200 freestyle relay at the world championships on Thursday.