In Japan, Shota Ishiwatari has invented a tail for humans that wags when the wearer is in a good mood.

The 'Tailly' is attached to a belt with sensors which takes the wearer's pulse. When the heart beats faster, the tail wags faster.

Shota says, "Tailly is fun to wear to parties, while out with friends or playing with kids. You could even wear Tailly on a date and express your true feelings through the wagging tail. Even better, your partner could also wear one, to add a level of subconscious communication between the two of you."

Watch the 'Tailly' promotional video below. Would YOU buy it? I can't believe this is real!