This is specially dedicated to people who "suffered" at work, to those people like me! haha! This is a tip for those who don't know how to fake a happy look/face, me? Hah, i'm one of the few gifted "actors" out there so this tips is useless for me! Anyway, here it is..
1. First you'll need two paper clips and rubberbands.
2. Assemble them as in the picture.
3. Apply the simple contraption as shown.