Your Guess is as Good as Mine!!!

I do pretty much all of my studying in the basement, and Grandma does pretty much everything in the kitchen, right above me. One of my favorite things to do is guess what Grandma is up to based on the noises going on upstairs. So far today Grandma has had five glasses of water (or some other beverage with ice...) and right now she's either roller skating or mopping the floor, except that I'm looking at the mop...