United Kingdom, Oct. 2 -- Benson Boone was left "horrified" after a fan unexpectedly walked in on him using a toilet with his pants "fully at [his] ankles" at his own concert.

The Beautiful Things hitmaker and two of his pals thought it would be funny to revive their unusual childhood habit of completely removing their pants while using a urinal at the gig's venue - unaware the space was being shared by the audience.

Benson, 24, heard someone enter the toilet and assumed it was a friend, but instead, he was met by a shocked concertgoer who gasped after seeing the entertainer.

Revealing the awkward moment, which happened two and a half years ago, on the latest episode of Brittany Hockley and Laura Byrne's Life Uncut Podcast, the Grammy ...