Little Johnny walks in on his …

Little Johnny walks in on his grandmother having a shower. He asks her what is that?
She replies “Oh! That is my beaver”.
The next day Little Johnny walks in on his mother having a shower. He then asks her what is that?
She replies “Oh! That is my beaver”.
Little Johnny retorts “Oh! Grandma has one of those too. But, I think it is DEAD, its tongue was hanging out.”