Back to Work

I had a few colleagues surprised when they saw me back in office today.

The various alarmed responses were:
"Aren't you supposed to be on Leave of Absence?!"
"Why are you back?!"
"How come you can come back?!"
"Didn't you see the latest email alert about H1N1?!"

My responses:
"No, I don't need to be on LOA."
"I am back to work"
"Why I cannot come back?"
"Yes, but it doesn't apply to me because I was back before the alert came out"
"COUGH, COUGH, COUGH (sound)"

I could see them paled significantly when I "coughed". It was only when I started laughing that they realised I was pulling their legs hahaha. :P