Google

When you operate the most widely used email service in the world, you'd better be really, really careful with April Fools' jokes that change how it works. That's what Google learned when it placed a joke "drop the mic" button right next to Gmail's regular "send" button as an April 1 gag. The joke button would insert into the email message an animation of a character from the movie "Minions" dropping a microphone -- a gesture to show you've gotten the last word in an exchange -- and then would mute the email conversation. Mute is a longtime feature of Gmail that hides conversations you don't want to follow and prevents future responses from showing up in your inbox.