Although your favorite messaging app, WhatsApp claims to be end-to-end encrypted and their first priority is their user's safety, and no third party can do anything on the account without your prior permission, there's this simple way to crash on your friends WhatsApp account without their permission.
Yes, without even letting your friend know, and also with no prior permission from him/her, WhatsApp users can simply crash on their friend's account, just by sending a message.
Following this simple trick can allow you to crash on your friends WhatsApp, be it individual or group chat, after which will your friend will not be able to open that chat box or the group you have crashed on, and will show a message stating "WhatsApp has stopped working".
#1 Click on the link below
Go to the Sharetext link, and just simply copy the code given on the website. This will the first step in the process to crash on your friends WhatsApp.
#2 Send a Message to Your Friend
Now, you can just copy and paste the code and on your friend's chatbox. This is nothing but a long unsupported text that your friend has received from your number.
#3 WhatsApp is successfully Crashed!
You're good to go now! After sending the code as a message to your friend, WhatsApp will automatically stop working, and your friend will no longer able to open your WhatsApp chat or message you.
However, this will be only for sometime, and your friend will be able to retain back their WhatsApp account after sometime.