"The first episode of Star Trek to actually air (but not the first filmed) was “The Man Trap,” which dealt with an alien shapeshifter who was obsessed with salt (it actually drains the salt out of people, killing them in the process). The alien is supposed to act creepy and obsessed when it sees the salt shaker on the tray. So, obviously, creator Gene Roddenberry needed the prop master Feinberg to come up with what kind of salt shaker the Enterprise would use".
"Feinberg went out and bought a selection of very exotic-looking salt shakers. It was not until after he brought them in and showed them to me that I realized they were so beautifully shaped and futuristic that the audience would never recognize them as salt shakers, and as he turned to go, I said “However, those eight devices you have there will become Dr. McCoy’s operating instruments.”
"For two years now, the majority of McCoy’s instruments in Sick Bay have been a selection of exotic salt shakers, and we know they work, because we’ve seen them work. Not only has he saved many a life with them but it’s helped keep our prop budget costs low".
We have this really big set of salt & pepper shakers...have fun with those that try to use them...can you guess which one is the salt and which is the pepper?