Simultaneous chatting with many on WhatsApp is really dangerous.
A message meant for one chat is unknowingly posted on the other thread and then you have to apologise like 'Sorry wrong window ', etc..
A man, by mistake, posted a message "wife and kids gone to her parent's house. M alone at home. Will you come over? " to his own wife....!
Then as usual... "Dear that message was meant for the pest control guy"....
The man's entire 1GB data pack was exhausted in convincing her.
She immediately came back home and the guy had to get the pest control done.
Moral : After typing, please check to whom you are sending. Otherwise you have to get the pest control of your house done without any reason!
For a happy life, POST control is better than pest control!