Would it be cool just to grab a dude and start kissing him?

Haven't had a kiss in years. Sad, because I'm sixteen and have not kissed a boy since I was seven. Been thinking about kissing the next guy I'm into out of the blue. Like, just grab him in the hall shove him against a wall and start going at it.
What is likely to happen?He'll be totally freaked out
Turns out he has a girlfriend that will beat my ass
I get detention for disorderly conduct or whatever
He asks me out and we start dating or casually hooking up
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Actually, I just want to do it because I enjoy making people freak out. I love seeing how people react to things for some reason.
Would it be cool just to grab a dude and start kissing him?
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