The veteran actor heard This Morning host Eamonn Holmes make a promise to douse himself in freezing water for a good cause during the Pride of Britain Awards in London on Monday (28Sep15).

So The Lord of The Rings star turned up at the studio where Eamonn works on Friday morning to make him take the challenge on-air, telling him, "Be a brave boy."

The actor then gleefully grabbed a bucket of icy water and threw it over Eamonn's head.

"That wasn't so bad was it?" he asked after the stunt.

The challenge was in aid of the IceBucket4MND drive, which is raising money for the Motor Neurone Disease Association.

The ice bucket challenge for the ALS Association became an online sensation last year (14).

Some of the biggest names in Hollywood took part, including Leonardo DiCaprio, Gwyneth Paltrow, Matt Damon, Ben Affleck and Jennifer Aniston.

Musicians including Justin Bieber, Britney Spears, Foo Fighters and Lady GaGa also took part.

The challenge raised a reported $115 million (£72 million) for good causes.

ALS is also known as Lou Gehrig's Disease or motor neurone disease.