One Direction's 'Rooftop Performance' in Sydney, Australia

Liam-This letter's U,you know it's true.It starts some words there are more than a few-ew-ew

Louis-U starts uh, and ugh up.U starts uden there's some in this cu-u-up.

Harry-Twenty-six letters are in the alphabet but we're here to sing about U.

All-U you begin the word ukulele,U there's a UFO flying by me.U and you're gone I feel so unhappy I love U, Ooh-ooh
U,you know you're so useful,U for unique that's a unique gown,U check it out Elmo's upside-down.U,there's a unicorn dressed as a clown,letter U-u-u that's what makes you so useful,Ooh-ooh
Harry-That's what makes you so useful.

Zayn-Don't get...