oh I see you are well-read too. I've thrown myself at floors, walls, ceilings, and people during dreams at one point or another. It's fun, sometimes I break other times the other thing breaks. Either way, there's always a mess
In your biography you have that quote from Hitchhiker's guide! Have you ever tried throwing yourself at the ground and missing in a dream? I did it in a non lucid once, it was an experience.