'Go' to Animal Kingdom, then 'go' to Rafiki's Planet Watch, then 'go' into the ladies restroom, then 'go' into one of the stalls... voila! there are different signs like this one on the inside of each of the doors.. hehe
DH says they have the same signs in the men's restroom also... I took his word for it..
BTW... I DID see a hippo 'going' just how the sign said that day while on the safari..then when I saw the sign, well, I couldn't resist..