I often wonder to modify whatsapp conversations and fool my friend but this is out now.Giving you tutorial on how to hack whatsapp conversations.
Note: This is applicable to root android user only.
Step 1 : Download Whatshack app from here and install in your phone.
Step 2: Choose a conversation you want to edit or modify whatsapp conversations.
Step 3: Tap on message and you will be popped up alert to change or modify message.