The combination of title and facial expressions brought a smile to my face. Thanks for that. ;^) This is fun to look at and you've certainly stopped the motion in an acceptable fashion. I almost wish this was a little tighter in composition but then you would lose the context of the place and situation. Perhaps some light gaussian blur to the left and right of the chute would have helped some? Just a thought. Best of luck to you in the challenge.
excellent idea, great capture of their expressions. too bad you didn't have one from a half-second later, when they made their splash. the framing is spot on.