Upon further inspection, I found a few spots on the floor where he had obviously dropped the ink pad, ink side down; bluish-black smudges all over a large plastic container near the closet; and worst of all, yet somehow cutest of all, tiny bluish-black hand prints on my beautiful, fairly new, white sheets.
I had to laugh. Then, I had to grab my camera. After that, there was a lot of scrubbing. Wipes. Soap and water. And then, we just went and took a bath. About an hour later, it looked like blue ink instead of black and was a little less obvious. And by the end of the day, it was pretty much all rubbed off, with just a little bit left under his fingernails. Now if only I could get it off my sheets.