Netflix's has been a treasure trove of hidden gems for fans, with the NYPD sitcom delivering blink-and-you'll-miss-it jokes that have viewers hitting rewind. The show's aficionados have been loving an obscure joke unearthed in season six, which gives a nod to one of Britain's Got Talent's most iconic figures. In the episode titled Return of the King, fans learn of a surprising familial link for Charles Boyle (played by Joe Lo Truglio), known for his extensive and quirky family tree.

The revelation that Charles Boyle is , the vocal powerhouse who became an overnight sensation on Britain's Got Talent in 2009, left audiences stunned. Susan Boyle's unforgettable rendition of I Dreamed a Dream from Les Miserables had originally captivated viewers worldwide, reports . In a seemingly offhand gag during Return of the King, Boyle informs his perplexed colleagues: "It's such a classic Boyle trait not to recognise talent.

My cousin, Susan, didn't know she could sing until her late forties." This line cleverly references Susan Boyle's late start in music, as she only stepped into the spotlight on the ITV competition at age 48. Brooklyn Nine-Nine has consistently amused fans with its outlandish Boyle family revelations, including the fact that Charles' "weirdest" cousin Milton is played by none other than 90s idol Ryan Phillippe.

Excited fans took to Twitter, sharing their glee upon discovering a sneaky easter egg, with one exclaiming: "omg susan boyle is charles' cousin in the brooklyn 9.