This is a water slide at Noah's Ark in the Wisconsin Dells. I acutally went down this slide, several times four years ago. You get up to the top and it looks like it goes straight down. The lifeguard up there won't push you down either, I tried. So, you have to get up the courage and drop down and then SCREAM!! It doesn't get any easier the second or third time either.
The red signs over the bottom of the slides post your speed. You can do this slide in apx 4 to 6 seconds, barely gives you time to scream. It was a blast, and my kids were pretty impressed that ole Mom did it.