Clicking at exactly the same time gives double up

When being two persons playing in a world and both go to the same chest . If both click (right) at the same time in the chest and one of those persons through in one thing (can be anyything!) into the chest then both persons will recieve this "thing". This means that "things" double up and can keep doing so over and over. ("thing" might be a diamond, iron, coal, wood, weapons plants etc.) if one keep clicking at exaktly the same time.