DFW-SEA on AA last Saturday, an FA dropped and broke a glass in the F galley as I was heading for the lav. They tried to clean up the pieces (at last - a good use for those safety instruction cards!) but chances are they didn't get every tiny bit. One of them said to me "that's why you never walk through the galley barefoot."
Aside from that, the lav is used by lots of guys standing up while the airplane bounces around. When the airplane bounces, guess what else does. I wouldn't want to be barefoot in there, either.
(BTW, what's with the blue and purple type? Makes things harder to read.)