I'll always remember "sledding" down the stairs with my bother and sister.
We used those old 80's style sleeping bags that had a sheen to them . . . probably 100 percent polyester, but who cares? Our stairs had a high pile carpeting (not quite "shag," but still, pretty thick for all that). It was nice and soft underneath the sleeping bags, but I remember if you really got cooking down the stairs that your bum would hit the edge of each step (thud, thud, thud, THUD!) and those last couple of thuds could really smart.
I remember I never let on to my siblings when it hurt . . . that would have ruined the game.
I also remember sometimes the out-of-control feeling was a little bit frightening, but I never let on about that either.