I found this on Failblog a few days ago and I keep going back to it to look at it again because it tickles me. I picture some poor person in a wheelchair zinging down that ramp and going thirty miles an hour into the street.
When you think about it, it's not funny at all. Totally inappropriate to laugh at that.
Then I think of the poor wheelchair guy who tries to wheel up that incline (what would you say that is, about 45 degrees?) and then I chuckle again imagining him tipping over onto his back like a turtle, or almost getting to the top, after a lot of exertion, and not quite making it at the end and again, zinging into the street, only backwards this time.
Again, not really funny at all. INAPPROPRIATE TO LAUGH AT! This picture actually just makes me realize what a rotton person I am. (Then I laugh some more!)