I recently used a Pi to replace the game controller on an arcade style basketball game we have in our office (like this: http://imgur.com/a/B7YBq). It's running Android Things and has a couple of fun new game modes, better sound effects, and a whole bunch of LEDs for added awesomeness.
A junior dev once thought it would be funny to quietly slip this into some code right before a release not realizing it had changed in lollipop. He was lucky I happened to have Goat Simulator installed and caught it.
if (!userManager.isUserAGoat()) {
... Super important business logic ...
}