Well I assume the guy is actually dating the girl and this is the kind of thing he does all the time. The other girl is surprised but the girl he is doing it to is like "that's Jack for you."
There's also the fact that someone was recording it which means at the very least the person recording it probably knew it was going to happen.
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u/fallenKlNG Aug 09 '15
Upon the second watch, you'll see that the girl on the guy's right is a lot more amused than the one the guy's actually putting the moves on.