This inventive little mug reacts to heat, and changes its external appearance as it warms up.
Available at Amazon for US$9.50, this heat-sensitive mug goes from asleep to awake as you pour your hot beverage into it.
When cold, the mug has a sleepy cold appearance, and once it heats up, it turns into a perky awake face.
A perfect gift for any coffee drinker!
(Source: Design Taxi)