What's App bombing is as powerful as terrorist attack

We are a couple who have gone far too crazy, what's app could become a toy for us. Silly Ah Lun has created a way to annoy his sister, and started to play this trick on me. I call it what's app bombing!! He just sent the same message 20 times continuously until he got a reply.
I know it's too silly and I have to put this into our hall of fame record for future laughs!