Niall Horan has never had so much fun - especially while shaking a banana. Don't mind saying I've watched it about 4 times already; from the musical prowess of The Roots on a pile of kiddies instruments, to Niall's banana shaking flourish around the 12 second mark, to double checking if Zayn got a solo (he doesn't for some reason...) - multiple viewings are mandatory.
If you've not felt properly, spine-tinglingly, squealingly Christmassy as yet this season, if this doesn't raise a goose bump, you need to seriously exorcise the Scrooge in you.