There may come a time when you want to turn off your body and fall off the grid for a while. Your friends may wonder why you’re not acting like your usual bubbly self. If they ask you what’s wrong, send the expressionless face emoji. That’ll show them how exhausted you are. You want to shut your brain off and not do anything productive. Your friends will immediately know that you need some space, and will respect your alone time. It just takes one little emoji to show a strong emotion, even when there are no emotions to feel.