Could have saved me several times

I can do it with my phone

Or slamming your flip phone closed after an angry conversation for the effect

Or being able to throw your phone without worrying about it breaking.

you can do it with the galaxy series :) just hold down the message and press cancel :D

Totally

If you have an iPhone, quickly turn on Airplane Mode. It'll stop the text and then you can delete it. That has saved me many times...