How hard would you have laughed? I literally farted ON a girl's head?

[Dude]

There is this really quiet girl who is really hot. My friend asked her out and she turned him down. Well we were walking to class and it was a nice day (we're in college) and we saw her sitting against a tree reading a book. My friend goes "that's her." I said "watch this." I snuck over, and all of a sudden put my leg over her head, and literally sat on the top of her head, straddling it. Right then, I farted, and it was a lot louder, and a lot longer than I had planned. She was mortified as my friend and i took off running, lol. How hard would you have laughed?