The song ended with Harper making the whooshing noise of the jet.
The mighty eagle rose into the air, its wings making great whooshing sounds.
On TDC with valves supposedly closed air is whooshing out of the inlet manifold.
You might have caught them on tour with Maximo and The Arctics, a whooshing of fresh air to blow your Libertine cobwebs away.
All that gurgling, whooshing and dripping represents a whirl of activity going on in the machine, and your cat is observant enough to have tuned into it.