This video apparently has 'gone viral' purely because an 'ordinary guy' gives the interview.
He was told 10 minutes before that he was going to interview her so was not prepared.
Mila Kunis was on a Junket (going around and doing interviews to promote forthcoming movie) and it was the end of the day, so she was apparently getting tired of answering the same old questions. So when this guy came, unprepared, asked her questions that she enjoyed and got into...
Fairly humorous and Mila is a sweetheart with him and fairly funny, tells him she can drink a pint quick because she used to bartend, and can pour a pint with no foam, "What?" LOL

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(He asks her out three times but I think when he went to the subject of "dropping 'trou'" was finally a bit much and when her 'handler' finally ends the interview

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She seems really cool and well grounded/down to earth as well as very hot...very much like how Haley interviews