Daniel Radcliffe, also known as Harry Potter, is currently starring in a movie called "Swiss Army Man," where he plays a flatulent corpse.
Manny, as the corpse is known, sometimes appears on screen not as Radcliffe himself but as a body double.
Entertainment Weekly has a video about how Manny was made. The special effects and makeup team made a full-body cast of Radcliffe, filled it, and made it up. The final product looks... well, not lifelike, but it sure looks a lot like Radcliffe. Maybe a tad paler.
To promote the film, Radcliffe is traveling around the US with Manny, and chronicling their travels on Instagram.