Changing tunes

Packing and stacking gifts to give under the tree, 
Mom : The wonder of Christmas is the spirit of love and giving don't you think ? And the carols and singing !! 
Elvish : ( Humming I want a hippopotamus .. ) 
Mom : Sing aloud !! I will join you while we pack 
Elvish : This song you can sing if you are young or old ...just change it a little bit 

I want a hippopotamus for Christmas
Only a hippopotamus will do
Don't want a doll
No dinky tinker toy
I want a hippopotamus to play with and enjoy

After a many many years when the mind is slowly slipping away

I want a hippo campus for Christmas
Only a hippo campus will do
Don’t want a lot
Just to find my dentures
And to tell what went in my stew