The Walking Dead, has recalled filming a particularly gruesome scene during which co-star Norman Reedus’ jokes made him “gag.”In the scene, Douglas and Reedus’ Darryl Dixon discover a zombie at the bottom of a well. While trying to remove it to prevent their water supply from being contaminated, the zombie splits in half.Recalling the shoot during a conference at Wizard World, Singleton said: “It was so nasty.