Holly Willoughby is no stranger to fits of giggles on This Morning.
But today she got the fright of her life when she set fire to her hand during a controlled science experiment.
Joined by science expert Dr Zoe Laughlin, daytime TV's dynamic duo was put through its paces with some experiments.
Mostly using flammable gases.
One experiment saw Dr Zoe show Phil and Holly an experiment using propane gas to set fire to their own hands.
After demonstrating, Holly asked Dr Zoe: "Oh my God. Did that hurt?"
Keen to test it herself, Dr Zoe squirted some bubbles onto Holly's hand, and Phil set fire to it.
Jumping and screaming as the flames ignited then quickly extinguished, she said: "Okay it was fine, it was fine, it was fine. It's exhilarating."
Okay it was fine, it was fine, it was fine. It's exhilarating.
It wasn't long before Holly's army of fans took to Twitter to share their delight at her reaction.
One said: "Love @hollywills she's hilarious" followed by a laugh and heart emoji.
Another chimed in, saying: "Love this bit @hollywills you had fire in your hand."
Other fans were quick to pick up Phil's reaction during the experiment.
"Lol love how Phil doesn't even react to Holly's panic!" said a tweeter.
The science segment also included Dr Zoe, Phil and Holly create a 'snow cloud' using liquid nitrogen.
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