Warning.

One of the things I like about my job is I get to work with machines that have signs like this plastered all over them:

Ion Implanters manufactured by Varian Semiconductor Equipment Associates are complex systems that contain high current; high-voltage power supplies; gases under high pressure; hot surfaces; toxic materials; ionizing and non-ionizing radiation; and mechanical assemblies that are in motion or which can move rapidly and powerfully in response to a command, a component failure, or noise on a command line which is interpreted as a command.

Only thing missing is a warning about spurious creation of extradimensional portals to malevolent hell dimensions.