Published Thursday, 13 December 2012
The Hollywood star hopped onstage at the Adelphi Theatre and ran through a comedy routine as the crew struggled to fix a screen that had come loose on the set.
DeVito was also joined by Heather Headley, the star of the musical, who led the audience in a sing-along of Happy Birthday for her director, Thea Sharrock, 36.
Sharrock, who previously directed DeVito in the London play The Sunshine Boys, tells London's Evening Standard: "It was so crazy but what a treat. And then Danny did a little stand-up while we waited. It was a unique night, one of those bonding experiences. The audience were fantastic."