It is being reported that a futuristic system, called Sensabubble, could alert you for Twitter notifications with little scented bubbles.

Sriram Subramanian, professor of human-computer Interaction in the University of Bristol Interaction and Graphics group has made a prototype of Sensabubble, for Twitter notifications, but the model is not portable.
Subramanian explains possible usage of the device in museums, advertising, alarm clocks or education.
Source-ANI