How some ~~federal~~ employees are pretending to work using 'mouse jigglers'.

FTFY.

This happens everywhere that managers are more interested in warming chairs than actually being productive:

• If you measure your employees by their work done, this isn't an issue; if they're getting what you think should be eight hours of work done in four, you promote them, pay them more and/or give them more responsibilities.
• If you measure them by the percentage of hours they spend warming a chair, they'll...warm the chair.