I couldn't wait. I like:

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When Dad came home he was astonished to see Alec sitting on a horse, writing something. " What on earth are you doing there ?" he asked.

"Well, the teacher told us to write an essay on our favourite animal. That's why I'm here and that's why Susie's sitting in the goldfish bowl !"
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Tim

And if yes, do you have any great jokes/stories for this context? Would love to hear 'em/archive 'em here.

Tim