Here is a helmet for people in jobs who have to do an unusual amount of smiling, such as flight attendants, receptionists and politicians.

A sensor in the front of the helmet detects anybody within a 2 metre range, at which point the mouth is pulled into a broad grin by a small servo motor and some concealed fishing wire. The helmet addresses the facades of social interaction and explores our responses to affected expressions. It is modelled here by Brendan Walker.

Link to video.