Before entering the asana hall to attend the asana class, I saw a notice in front of it. It read as...
Please close the door otherwise flies will do the asanas with you.
In the end of asana class, the hath yoga teacher said, "Dear students, Please keep the door closed whenever you go out or come in the hall. "
One of the students complained, "Ya, the flies and mosquitoes came in."
The naughtiest student of the class said, "Who is afraid of flies? I am afraid of monkeys, they might not come in and bite me."
While I was laughing on the joke, I saw a big monkey passing from the corridor next to the hall.