Put it after the reveal or the name drop, once the audience already knows who is being called out. Open with sudden suspense to build the moment, then follow it with Nelson's Ha-Ha to close the beat.
このサウンドについて
This short spoken clip runs just over three seconds and delivers the line naming Santos as of the devil in a single pointed statement. It lands as a playful, dramatic accusation, funny because it treats an ordinary name with sudden mock-serious blame, and it works best as a quick jab rather than a long explanation.