Place it just after the stranger enters the frame, then follow with the You What sound for a double-take reaction before cutting to the group's response, and keep a second reaction sound ready for the next unwanted interruption.
About this sound
This 5-second clip captures Conor McGregor asking who an unfamiliar man is in his distinctive Irish accent, the question landing blunt and dismissive. It gives listeners a mix of confusion, mockery and comic swagger, turning a stranger's sudden appearance into a joke. The line comes from the MMA star, whose delivery made it a go-to reaction clip.