What would あなた do if.....

Poke him in the cheek and say "turnip."

Get a few autographs 4 my friend Rachel & the ppl who'd be willing to pay me 4 them.....then slam that door right in his face

"Who is it?"
"Yo, it's JB!" xD
"..."
"Yo?"
"..." *walk into my room and crank up the tunes*

How come Justin likes to act black? :P

Yell, "WHAT ARE あなた DOING HERE?" Then I would yell to anyone who hears, "I THINK IT'S FOR YOUUUUUUUUUUUUUUUU!" Then I would 表示する him to my friend who likes his music. Then I would get his autograph to brag to everybody. Then I would sell it on eBay.

i would proceed to knock my fist against his face!

kick him in the yahoo's and close the door... the come out side again and spill my drink on his hair and say fag then close the door

Nothing.
I never open the door to strangers.

CLOSE THE DOOR jk i really dnt care または know

dont like him but i would jump and tell my フレンズ who like him just to make them jealous because all of the mean girls like justin bieber!but i sutre think i would be creppy!

Id be like dude whats ya doin here

Hi Justin!Want to go in my cold basement where all my weapons are!

I would yell out down the 通り, ストリート that Justin Bieber is her so that his 'fangirls' might hear and then slam the door in his face. If i had a glass of anything in my hand I might also toss it on him...