I was once told by a Navy fighter pilot the following:

"The only switches necessary to safe flight are the 'Shiny Switches". They get that way from repeated use, and since the aircraft is still in one piece, they are only involved in safe flight. Having said that, any aircraft with the emergency controls/switches that are shiny is trouble. Someone before you has had some thrilling experiences, repeatedly."

Only touch the Shiny Switches.....