The Sliders alum and his two daughters were spotted at Universal Studios Hollywood surrounded by killer clowns! Even Hollywood celebrities can't resist the frightful delights of Halloween Horror Nights, as Jerry O'Connell recently proved. "HANDS DOWN, our favorite night of the year," the Sliders alum wrote on Instagram, sharing a photo of himself surrounded by his two daughters, Dolly and Charlie, and a cadre of killer clowns at Universal Studios Hollywood. “This year has evolved into something I think everyone’s going to like as a creative entity.”When is Halloween Horror Nights 2025? Halloween Horror Nights 2025 is now underway at both Universal Studios Hollywood and Universal Orlando, with the frightening festivities running through Sunday, November 2.