"What Sound" joke

A group of young children were sitting in a circle with their teacher. She was going around in turn asking them all questions.

"Davey, what sound does a cow make?"
Davey replied, "It goes' 'moo''."

"Alice, what sound does a cat make?"
Alice said, "It goes' 'meow''."

"Jamie, what sound does a lamb make?"
Jamie said, "It goes' 'baaa''."

"Jennifer, what sound does a mouse make?"
Jennifer paused, and said, "Uhh... it goes...' 'click''!"