Actors Mark Ruffalo and Michael Sheen proved they have hidden depths during a U.K. talk show by showing off their beatboxing and circus skills.

The two screen stars were both invited onto The Graham Norton Show as guests, and they were keen to display their alternative sides when the host invited them to demonstrate their secret talents.

The Queen star Sheen stunned the audience by 'beatboxing' the famous theme tune to Tv series Dallas, and The Avengers actor Ruffalo proved he would be a great ringmaster by showing off his circus skills.

British actress Amanda Holden, who was a fellow guest on the show, then joined in the fun by standing on her head.

The episode is due to air in the U.K. on Friday (06Jun14).