Where's the fire?

When I was walking down the hall the other day I heard a strange noise coming from the kid's bedroom so went to investigate. This is the sight that greeted me.
I asked Smudge what they were doing, and she said they were firemen riding their firetruck down the road to fight a fire. Her right hand was in the air and she was pulling down on an imaginary cord while making a "whoo0000oooo00000oooo" sound the fire truck makes. JJ followed along in suit.

They had their firemen hats firmly placed on their heads and were ready to save the day. I ran for my camera.