Gibson turned down starring as Elliot Ness in The Untouchables for Lethal Weapon.
Man, I’m glad he did as I love me some Lethal Weapon, but still, it would have been cool to see Gibson go toe to toe with De Niro and play off Connery and Garcia. I like Costner and love the Untouchables but Costner’s acting was the weak link in the film, imo, and I think Gibson would have matched his peers performance wise.
https://fandomwire.com/mel-gibson-gambled-his-career-by-rejecting-1987-robert-de-niro-sean-connery-cult-classic-spawned-952m-the-untouchables-franchise/