The pair were did another trick which involved cards and judge David Walliams thinking of a word in his mind.
During the performance, DNA enlisted head judge Simon Cowell for help as they asked him to find a page in a dictionary and read the 11th word in the third column.
Simon, 57, appeared to get flustered as fellow judge Amanda Holden rushed to his aid as the clock ticked away to help find the relevant page.
The Britain's Got Talent judges took quite a while to locate the right page as Amanda, 46, informed them: “He’s not wearing his glasses.”
DNA were heard talking to them from the stage but Simon was getting flustered as he bluntly told them: “Yeah, we’re trying to find it.”
It took them several minutes for them to eventually find the page and the word, which Amanda had to verify and they confirmed the word “probably”.
Simon Cowell nearly appeared to ruin DNA's trick on Britain's Got Talent
Simon Cowell did not look impressed on Britain's Got Talent
Yeah, we’re trying to find it
For a moment it looked like they would not be able to find the page or even the word that the mind readers were asking them to search for, which could have potentially scuppered the whole act.
"This is the smallest numbers in the whole world!" Simon exclaimed, clearly not pleased at having to read tiny writing from a huge book.
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Little Britain comedian David, 45, then revealed the piece of paper in his jacket with the word “probably” written on it, leaving the entire panel speechless with shock.
Britain's Got Talent act DNA perform in the first live show Britain's Got Talent stars: where are they now Sat, April 15, 2017
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Susan Boyle was runner-up to Diversity on Britain's Got Talent in 2009 has since toured the world, performed for the queen and sold millions of records
Simon Cowell and Amanda Holden help out on Britain's Got Talent
Despite the slight hiccup, it looks like the public loved the performance by the pair and they ended up getting the most votes from viewers.
Along with golden buzzer act and singer Kyle Tomlinson, they went through to the next round of the competition.
This year the judges do not have a say in the semi-final live show results, which Simon admitted was a relief to him as the public made the final decision.
Britain’s Got Talent continues on ITV tomorrow evening at 7.30pm.