He started out his experiment by putting the money for a spin in a washing machine - but the note was left in perfect condition afterwards.
Out of frustration he then attempted to tear the paper cash with his hands before using his teeth, which finally caused it to rip.
Chuffed he found a method to destroy the cash, he then tore another £5 note with his teeth in celebration, leaving Susanna Reid shocked.
"I cannot believe you just did," she said. "I'm not sure if that's even legal. We'll have to look into it."
Meanwhile, Piers' potentially illegal antics sent Twitter into meltdown as stunned viewers took to the social networking site to express their shock.
One fan wrote: "@piersmorgan You're going to jail for destroying money Piers."
Moments later, a different viewer wrote: "@GMB @piersmorgan It's also against the law to deliberately destroy banknotes without the proper authority."