Even 'The Hulk' loses his wallet

Actor Mark Ruffalo had his lost wallet returned by a stranger who contacted him on Twitter.

The 46-year-old actor - who played The Hulk in 'The Avengers' - left his wallet in the back of a cab in Chicago, but was delighted it wasn't gone forever after a fan contacted him on Twitter to say he had picked it up.

The Power of Twitter!

Great to see some genuine people in the world shining through.

"I have your wallet. Found it in a cab in Chicago on Friday. Let me know the best way to get it back to you. Thanks," the good Samaritan tweeted the star.

It took a couple of days for the actor to see the message, but he could barely contain his gratitude when he did respond.

"Thank you! Wow! Another point for the decency in people."

@Trezeduet thank you! Wow! Another point for the decency in people.

— Mark Ruffalo (@MarkRuffalo) July 21, 2014

The pair then reportedly exchanged a few direct messages on the social networking website to arrange the safe return of the wallet.

The 'Begin Again' actor later concluded: "You are a hero!"

@Trezeduet You are a hero!

— Mark Ruffalo (@MarkRuffalo) July 21, 2014

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