Phillip Schofield and Rochelle Humes got a case of the giggles as they spoke to a woman with a fear of custard.
The This Morning hosts were joined by The Speakmans on Monday's show as they opened up the phone lines to viewers.
Among the callers was Michelle from Manchester who wanted to talk about and get advice for her unusual fear.
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"I call it the yellow stuff you put on apple pie," Michelle said, unable to tell the experts and the presenters about her custard phobia.
But as they got stuck in to trying to help, they encountered a problem.
Poor Michelle kept gagging over the phone whenever custard was mentioned, leaving Rochelle and Phil in stitches.
Explaining where she thinks the fear stems from, Michelle explained: "It was from my childhood. We were forced to eat it and it wasn't the best of the stuff when I was younger. It was lumpy..."
She had to stop as he gagged, unable to say the word.
Michelle then vowed: "I promise you, if you can get me over this fear I'll have a bath in it for charity."
But the longer the conversation went on, the more the gagging continued.
As they began to wrap up the call, Phillip sent an apology on behalf of himself and Rochelle.
"Listen, I am so, so sorry Michelle for laughing," he said. "That really is just an extraordinary noise."
The 59-year-old then added when Michelle had gone off the phone: "I feel terrible for laughing, but it's just such an awful noise."
And This Morning viewers felt the same way.
@laurendasx tweeted: "Listening to a woman gaggin over custard is not what I need this morning. Jesus #ThisMorning."
"Get me out of isolation!! Currently watching #ThisMorning listing to a woman gag over the phone every time she hears the word ‘custard’…" @kieranclements6 said.
@SteveBa99880334 wrote: "This is the greatest interview I’ve ever heard. Every time they said “ custard” she started heaving #ThisMorning."
But @dizzyellena shared: "Think its rude how Phillip and Rochelle were laughing at the lady on the phone who says she is scared of Custard . To them its a joke but it isn't #ThisMorning."
"#ThisMorning if this lady is genuinely terrified of custard is everyone laughing at her a good thing?" @ickle_meg added.
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