As a college student, I was standing by the clothes washer at the washeteria, reading a book, and waiting on the last three minutes or so of the spin cycle to stop. I was the only person there & it was after dark...this was in the late 1970s - so before cell phones.
I got tapped on the shoulder and when I turned around to see who it was and what they wanted, some blond idjit was backing away from me. I didn't recognize him, so I went back to my book (science fiction, in the middle of an exciting scene, and much more interesting than some strange guy tapping the shoulder of a married* woman for unknown reasons).
Only to do a classic spit-take/double take when it penetrated my science fiction battle scene hazed brain that - he had his pants unzipped, pulled down around his hips, and his hands were trying to hold up his "junk" while playing with it, apparently in expectation of freaking me out for his kinky "delight". I hadn't noticed much about his "junk" other than it wasn't immediately obvious to a near sighted person at a distance of ten feet...
I never got flashed at that laundromat again...alone or not!
*Mentioned only because I knew what guys looked like without clothes at that point.