Whatsapp message contains "This is very Interesting!" coupled with emoji laughing to tears can damage your Android smartphone. The message has a hidden symbol between spaces.
When the user taps part of one of the messages, the hidden symbol will expand and cover WhatsApp and Android OS. It keeps apps and smartphones off.
Then the second message gives information that what happens if the user taps the message part. "If you touch this black dot then WhatsApp you will hang," write a text message with a big black dot. The message certainly makes the user curious then tapped on the point.
when the user taps the black dot, it will convert the text to html which means some type of data theft has occurred. WhatsApp confirmation efforts on this matter are still being done. And it is not known how long it will take WhatsApp to solve the problem.
May be useful.