The man who inspired people around the world to dump buckets of ice water over their heads to raise millions for motor neurone disease research is back in hospital - and maintaining his sense of humour.

A little too much, perhaps.

Gaga, Oprah, Ronaldo, Steven Spielberg and Charlie Sheen are the latest big name celebs to take on the challenge.

Watch Robert Downey Junior, Bill Gates and Mark Zuckerberg get soaked with ice water.

“I’m freezin’! Absolutely freeezin’!”