Before we hit the dance floor , boys , tell us a bit about your best party memories…
Harry: Danny's 21st was a pretty good one. It was in a big marquee and there was a bucking bronco!
Danny: Yeah , it was the best - there was even a mini casino!
Tom: I had a cool fancy-dress party for Halloween last year. I went as a dead pirate. I don't know what Harry was meant to be , but he was wearing leopard-print pants and a fake beard!
Dougie: I went as a chav and I got my dog , Flea , a yoda outfit , but he wouldn't keep it on. I want to do a fancy-dress mcfly tour - it would be really funny.
Whos the ultimate party animal of the band?
Tom: Danny! He's always going out and he's the first one on the dance floor
Danny: Yep , it probably is me. I like to socialise and I don't like missing out on anything!
Whats the worst party behaviour you've ever unleashed?
Dougie: We threw plates out of our hotel room window once - not clever , I know. But it was into the sea . . . that's how rock and roll I am!
Danny: One night at a karaoke bar , me and my mate tried to sneak into someone elses booth , 'cause they were singing all about you. I was shouting 'you're singing my song!' but they wouldn't let me in.
Whos most likely to get kicked out of a do?
Tom: Harry! He gets a bit hyperactive and does silly things. He'd do something stupid like stand on a table or get lippy with the bouncer.
What about humiliating yourselves by getting over-excited?
Danny: As soon as I get on the dance floor I embarrass myself! I'm not a serious dance , I just have fun. My signature move is taking the mick out of other peoples dancing.
Harry: When I was 13 , I was running around at a party in a barn when I ripped part of my ear off on a nail , I had to go to hospital and have it stiched back on.
Can you match that , Tom and Dougie?
Tom: Well , we were out for Dannys birthday one year and I walked straight into the glass door of a pizza restaurant. I hit the glass so hard it nearly knocked me out . I couldn't stand up and my girlfriend had to take me home before I'd even got to the party.
Dougie: We usually get naked in mine or dannys hot rub at parties , just 'cause its funny! We had a good time camping in Cornwall a while ago , too , as they had a zip line. Harry ran off the end of it and somehow managed to rip an entire trouser leg off!