Reddit users thevincentasteroid and MMD3_ posted about an auto-playing video ad (with sound) on the home screen. The ad is for Chicken Tender Wraps from Carl’s Jr. When it begins auto-playing, it pushes all the other UI elements out of focus and goes almost full-screen, returning to the home screen after it has played through once.
Yes, there is an app called Button Mapper that allows you to map any button to any app, even special functions and utilities. It also allows for special behavior when double clicking or long pressing.