Upload two images, and click on the share button to share the image in messaging apps like whatsapp.
The image will be having the preview of image, and after downloaded will change to another image.
this is very fun.

You can only see the original once sent.
Only the person receiving the image will see the change, and that too only if they have disabled media auto download.

April Fool Prank
April Fool
Image Preview changer.
Prank your friends
Prank wife.
Prank husband.
Prank Sister.
Prank brother.
Prank mom, mother.
Prank dad, father.
Prank Love once.