This is your late night debut. -Yeah.

[ Cheers and applause ] -Wow. This is exciting.

This is excited. -I don't even know how to sit.

-No, you're sitting perfect. -This feels good.

-That's how you sit right there.

Describe your channel

for anyone who has not seen your video.

-Sure, I think the best way to describe my channel would be,

my friends and I just finding a new way to have fun every day.

I think that's what it is. There's like 20 of us.

And we run out of things to do a lot,

and we just got to get creative and have fun.

-Well, people love it,

'cause you have over 15 million subscribers.

And over 6 --

[ Cheers and applause ] -Thanks.

-15 million subscribers on YouTube

and 6.5 billion views.

-Yeah. It's going well so far.

We don't know. -That's fantastic.

I love it.

You also start the giving out -- You surprise people.

You give them iPads or cash, even.

-Yeah, yeah. We got to --

Like, over the last year, we got to surprise

a little over 15 of my friends with brand new cars.

So, that was... That was...

[ Cheers and applause ]

-How that's grown, that's crazy.

-Yeah. -It started with what?

How did that start?

-I used to watch

military surprise coming home videos,

like, online all the time.

Like, I love people's, like, reactions to things,

whether it was a good reaction or a bad reaction.

So, now I have this opportunity where I can, literally,

get a reaction out of a lot of people.

So, I'm kind of just addicted to the whole thing.

It's super selfish.

A lot of people are always like,

"That's so sweet that you do it,"

but, like, anybody in my shoes

would do the same thing

and just get your friends whatever you want.

-It does make you feel good, yeah, when you do that.

I thought one of my favorite ones you did was,

You surprised some fans with Justin Bieber.

-I did. Yeah. -The actual --

-I surprised myself with Justin Bieber.

-The actual Justin Bieber. -Yeah.

-Where were you again?

-Well, we were -- we were sitting in my car.

He was in the backseat,

and we picked up kids around UCLA,

and I told them that we were doing, like, a pop culture quiz,

and then he would pop out when I asked them

what they thought about Justin Bieber.

I met him at the club, like, a month and a half ago.

-What is the club?

-It was at a club, but it was, like, um...

-It's called The Club. -It's called Doheny Room.

-Oh. -I've been kicked out of there.

I shouldn't have given them that plug.

-We can bleep it out, and we'll say Dave and Busters.

-[ Laughing ] Dave and Busters.

-But I saw him at the club,

and one of my friends was like,

"You're gonna meet Justin Bieber."

And I just remember --

Everyone knows Justin Bieber, right?

Like, everyone grew up --

at least I grew up listening to his music.

I know all about him. I was so nervous.

-Me too. -Yeah.

[ Laughter ]

-And he's walking -- He's walking over to me,

and I say, "Hi, I'm David," and he's like, "Hi, I'm Justin."

I was like, "I know!" I was so excited.

And then you're at the club,

so you're kind of just standing

next to each other for a little bit,

and then he walks by me.

He walks by me like he's going to get a drink.

-Do you want me to be you? -Yeah, you be me. You be me.

[ Cheers and applause, upbeat music plays ]

Yeah, it's like this. We're at the club.

And he walks by me, he walks by me,

and he goes, tickle, tickle.

-[ Laughs ] He did not!

No, no. -I swear to God.

I swear to God, and he said it out loud.

He goes, "Tickle, tickle," and I go, "Okay. Cool."

[ Laughter ] I go, "We're here."

Tickle, tickle -- He did that.

-It felt so good after he tickled me.

[ Laughter ] -He is a really funny guy.

-It was the best ice breaker when he tickle me, yeah.

-He's really a funny guy. -Oh, he's the sweetest.

Here's David Dobrik surprising college students

with Justin Bieber in the backseat.

Take a look at this.

-What do you think about Justin Bieber?

-Oh, my God, love him, but "Yummy" is just, like, not it.

It's not that good.

-It's not it. -Oh, my God!

-It's not it. -Oh, my God!

[Bleep] I love you. -How are you?

-Oh, my God. -What the [bleep].

"Yummy" is good. I changed my mind.

[ Laughter ]

♪ Got that yummy, yummy ♪

[ Cheers and applause ] -Wow! How fast.

-Yeah. -How fast he changed his mind.

-Yeah. -[ Laughs ]

I thought that was great that Justin did that.

-Oh, my gosh. So great.