Well after it ended Y comes to me and says, "mommy, I can't find a box big enough." After more questioning I figured out that she wanted to decorate a box and pretend to go sledding. Well we didn't have a big box (or any box) available so I told her to just use the laundry basket and pretend.
A few minutes later I hear, "watch out Q, I'm going tobogganing." Q had been playing on the stairs so after a quick moment I began to wonder if Y was actually going to try to go tobogganing down the stairs. I dropped everything and moved as fast as I could to discover Y near the edge of the steps ready to push herself down. Fortunately we were able to stop her before she pushed off but we had to explain that it's just pretend, that she can't actually go sledding in the house OR down any set of stairs.
She was sad but did allow us to snap a quick picture and have a good laugh.