ARIANA GRANDE went a little unconventional with her "One Last Time" video. Because it ends with the world being destroyed by comets. But at least Ariana is making out with a guy as existence blinks out. The clip is pretty grim for a pop video. The end of the world has begun, and Ariana is running through the chaos in the streets, then through a building . . . before she ends up on the roof, kissing the guy who's been running behind, filming her. Then we all die. Have a nice life.