True Story from Australia
This is a notice in the mens’ room in my university.
University of Tasmania - Office of Occupational Health and Safety:
PRECAUTIONARY MEASURE
To avoid injury to fingers, please press flush button with flat of hand.
In event of finger becoming stuck in tube, call loudly for assistance. Rescuers should obtain a key to enter cleaner’s store, between Ladies’ and Gents’ lavatories. Fingers can then be pushed back from there.
This method is also applicable to free the flush button, if it has been pressed too far into the tube and is causing the cistern to run continuously.