The Wheel of the Bus

While I was making the milk for Timmy, I was singing this song:
"The wheel of the bus go round and round, round and round, round and round, the wheel of the bus go round and round, all through the town....

Without thinking, I continued with the 2nd verse:
The wiper of the bus go round and round, round and round, round and round...

Timmy: "Mom....the wiper of the bus go round and round?"
"It should be, the wiper of the bus go sqush...sqush...sqush... (while moving his arm, like a wiper) hehehehehe...

Me: "Hah? hahahahaha...Oh ya Tim..."

Hehehehe...