not cleared the snow/ice off of their stairs/sidewalk and had someone slip and fall on them.

I just read the answer...actually something no one guessed could be an answer. Toe thumbs, also called clubbed thumbs. It is very rare, and is a shortened thumb, just as it sounds, with a wider nail bed than usual. Some look different than others. One DGD has them. The statistics are ‘between 0.1 and 3 percent’ of the general population, which leads me to believe no one really knows, and some probably are not reported.

Varieties of cheese? As in the mold used to make the whole cheese, not the resulting shapes you can buyprepackaged in the store.

How many people they've slept with before they met their current significant other. (Hey, it's the only thing I could come up with that hadn't been guessed before. Bank accounts was already taken.)