Cartoon Beatbox Battles - But The characters Have The Wrong Voice is a video made by verbalase, and the first episode of Cartoon Beatbox Battles - All Mixed Up. In the video, verbalase does Pennywise's first beatbox solo, but with Mickey Mouse singing it. More episodes of this may come soon, and the next might be Pennywise doing Thanos's first beatbox solo, as from his instagram.
Mickey Mouse as Pennywise. This is used in the video, but the video version has buckteeth.