The That basically stand on the roof of a Los Angeles skyscraper. They emote and rapidly vibrate—apparently they've got the music in them.
For some reason, L.A. is portrayed in this video as some post-Apocalyptic, Bedlam-looking hell. Oh, wait...
A bunch of pollen flies around in the air and Gary Barlow starts sneezing. I know, Gary, the Santa Anas get me every year, too.
Finally, the West Coast sun is too much for the lads' pale English skin, and they spontaneously combust.
Either that or they realized this song is no "Rule The World," and they're like, "Yeah, later..."
Here's the vid for "Greatest Day":