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Benedict Cumberbatch and Pink Floyd wow fans at London rock gig | Daily Star

The famous 70s musicians were playing one of a string of shows at the prestigious London venue – but obviously needed one more brick in their wall to kick the show into action.

Benedict leapt on stage to fill the gap – singing Comfortably Numb to the cheering crowd.

The lyrics to the song go: "Hello. Is there anybody in there? Just nod if you can hear me. Is there anyone at home."

And there certainly were as fans went crazy for the Sherlock star's cheeky guest appearance. ELEMENTARY MY DEAR ROCK BAND: Benedict Cumberbatch sings on stage with Pink Floyd

Viewers of the clip online were equally vocal about their enthusiasm.

One Twitter user wrote: "Ben!! Yes!! So much Fun!!"

Another commented: "Wow! Wish I was there!"

But some weren't too keen on his singing.

One wrote: "I love Benedict but this was bleurgh."

Hello? Is there anybody in there? Photo: https://t.co/JyeQXoQJcX pic.twitter.com/lPuui3M15s

— Cumberbuddy (@Cumberbuddy) September 29, 2016

And another added: "He seemed to be reciting the verse instead of actually singing it. Seems more like Karaoke!"

Let's hope the song's closing lyrics don't stop the Doctor Strange actor's prolific output: "The child is grown, the dream is gone. I have become comfortably numb."

But he's not the only star to wow crowds with surprise appearances.

Earlier this year Back to the Future stat Michael J. Fox joined Coldplay on stage during a New York gig.

And Ed Sheeran fans went into meltdown when they discovered that he makes a quick cameo in new movie Bridget Jones's Baby.