Double Earphones

A lot of times, on the bus, at home, etc. people want to share their ipods and other listening sources. They often have one earphone each and listen using one ear. Instead of doing this, why not make an earphone adapter that converts one ear phone input into two separate ones. That way, both people can share a listening source and use their own headphones. The device should be small and the double input part should be wide so it can accomidate all types of earphones. ANother alternative is to have it branching out so the two inputs have their own cords that adjoin into one. This gives more freedom and flexibility but the wires can get tangled.