These are the ones I use in my classroom quite regularly: 
 
Diane? Diane??? You �re not listening! You �re having your head in the clouds again, aren �t you?
 
The weather is horrible today. It �s raining cats and dogs outside!
 
Don �t try to fool me, my dear kids... I �ve got eyes in the back of my head!!
 
Look at Sandra - she �s a busy bee today, isn �t she??
 
Come on, David, you �re as slow as a snail today! Get a grip, will you?
 
A little bird told me that you haven �t done your homework.
 
Don �t be so nosy... Remember that curiosity killed the cat!
 
Sit still, Julia, please! Have you got a bee in your bonnet??
 
Shhh, be quiet now and listen! Silence is golden, kids!!
 
Don �t listen to George - he �s just green with envy, that �s all...
 
This exercise is not as hard as it seems. I �m sure you can do it! It �s a piece of cake, honestly!
 
What exactly do you want to tell me, Lisa? Just let the cat out of the bag!
 
No, we �re not writing a test today, hehehe! I was only pulling your leg!!
 
Hope it helps...
 
Love - Silke