Back in the early-90s I accompanied a friend and his grandfather to an indoor firing range here in southern California. They had a whole rack of these yellow safety glasses on the front counter, and because they'd had so many non-shooters come in to ask about them one of the employees taped a hand-written card to the top of the rack that said, "Just like the ones Mel Gibson wore in Lethal Weapon!" :rolleyes
While I was chatting with the guy behind the counter, he directed my attention to something hanging on the wall behind me. It was an unused duplicate of the "Have a nice day" target prop used in the movie, signed by Mel Gibson, Danny Glover, and Richard Donner. Turned out we were at the firing range where they had filmed that scene.