Surgeons use markers to identify the right body part for procedures. Unfortunately, they care become contaminated with bacteria which can lead to surgical site infections.
Enter the Sharpie: “As it turns out, the ink used in a Sharpie pen has an alcohol base, making it an unexpected germ fighter.”
Who knew? The Sharpie is probably also many times cheaper than the single-use “sterile” pen used commonly on ORs.