Behind the scenes, though, the romance was undercut a tad by the same thing that ruins most prom nights and trips to IKEA's dining hall. You see, for most of the film, Fishy McHandsome was played by Doug Jones, the renowned creature performer who previously played the Pale Man in Pan's Labyrinth and Hellboy's pal Abe Sapien (the mutant fish-man who didn't get any). However, the producers also brought in a "dance double" for the musical number, and presumably to stick around in case the monster was invited to appear on Ellen.
It ... didn't go so well. In an inadvertent testimony to the skills of Doug Jones, once inside the costume, the dancer "did one take, vomited, and passed out," as that wet, heavy, ultra-tight fish suit was way too intense. According to Del Toro, the poor guy "did one pirouette, and then proceeded to projectile vomit." If you ask us, they should have kept that shot and pretended that covering your partner's face in puke is part of the fish people's mating rituals.
Fox Searchlight Pictures