In 1985, workers renovating London’s Tate Britain art gallery discovered a handwritten message behind a wall in the rotunda dome:

This was placed here on the fourth of June, 1897 Jubilee year, by the Plasterers working on the job hoping when this is found that the Plasterers Association may be still flourishing. Please let us know in the Other World when you get this, so as we can drink your Health.

It was signed “W. Gallop, F. Wilkins, H. Sainsbury, J. Chester, A. Pickernell, Secretary.”