Old Macdonalds

As we're driving on the ECP getting near to Marine Parade, Shannon inevitably starts singing "Old Macdonalds had a farm" and it doesn't quite occur to me why.

Suddenly we're going past the big M sign and it makes sense.

Shannon: Mummy, look! Old Macdonalds!
Celest: Shannon, it's not Old Macdonalds, it's just Macdonalds, it a restaurant.
Shannon: Why?
Celest: Old Macdonalds had a farm Shannon. This is just Macdonalds.
Shannon: (pause)
Shannon: I like Old Macdonalds mummy!

Give up.