In this day and age, more people are getting comfortable with idea of letting robots do things for them. Buying a robot to stir your coffee may be overkill, but you can always build your own remote controlled coffee stirring system. This video from Rian Josua Masikome shows Stiremote, a RC coffee stirring system, in action.
This device stirs your coffee using a remote control. An Arduino Uno was used to complete this project. Pretty simple but gets the job done.