When father-son duo Stavros Flatley stepped onto the Britain’s Got Talent stage during the 2009 auditions, no one expected what came next. But within moments, all three judges were in stitches, completely won over by the pair’s hilarious dance routine and larger-than-life personalities.

With a nod to Irish step dancing—and their own hilarious twist—Stavros Flatley kicked off their act with a quirky introduction that left the judges scratching their heads. But the second dad Demi Demetriou burst out from stage right with uncontainable energy, the audience erupted into laughter.

Demi and his son Lagi became instant fan favorites and went on to achieve international fame after their appearance on BGT. One of their career highlights? Performing for the Queen of England at the prestigious 100th Royal Variety Performance in 2012.

Check out the video below to relive their unforgettable audition—funny, unexpected, and full of joy!