A Horse, of Course

Bobbie is going to school for the first time, and she will go by bike. That’s what her mum and dad think…
‘What do you want Bobbie?’ her dad asks.
‘I don’t want a bike.’ Bobbie has given this lots of thoughts. ‘I want a horse.’
So, when the present turns out to be a bike, Bobbie isn’t left with much of a choice, but a swap…
The bicycle is swapped for a moped, the moped for a car, the car for a sailboat, and the sailboat for a helicopter.
But Bobbie is more than certain:
‘I want a horse!’
Perhaps she can swap one more time?