Google had two April Fool's jokes this year, one being the introduction of Google Cardboard Plastic, which is a VR headset to experience real life. It's simply clear plastic that you'd wear on your face just to see the real world through it.
The other April Fool's joke actually altered the way Gmail behaves, and it had some disastrous results. It was called "Gmail Mic Drop," and it replaced the "Send & Archive" button with "Send and Mic Drop." This inserted a goofy animated GIF of a Minion doing a mic drop.