In the Car and Having Fun is a Barney song that first appeared in "Barney's Big Surprise". It uses the same tune as "Over the River and Through the Woods".
Lyrics
In the car and having fun
to Tinkerputt's we ride.
There's lots of time for learning rhymes
with Barney as our guide!
In the car and having fun,
the trees go racing by.
It's so much fun, out in the sun,
singing while we drive!