I 'made' an older gentlemen as I was entering and he was exiting the men's room at the university I was studying at back in the day. He was wearing khaki pants and a pull-over sweater that gathered/had elastic at the waist, but was otherwise fairly loose fitting. While still in front of him, for some reason my Spidey senses told me he was armed. As we passed each other our right side I glanced back, and sure enough, there was a distinct pistol-sized bulge behind his right hip. I'm guessing he was a trying-not-to-look-like-a-LEO LEO that didn't succeed...at least not with me.