As the Lethal Weapon film series progressed, each movie got more cartoonish and filled with physical hijinks, but evidently that won't be an issue for the next installment. Calling it Lethal Finale, Richard Donner has said that Lethal Weapon 5 (written by Channing Gibson) will be "very dark," as the director wants end things on an "emotional note." This suggests that we'd be getting something more tonally similar to the first Lethal Weapon, where Riggs was suicidal and making reckless decisions while on the job, and the villains were nothing to laugh at. Debate will continue among fans about if Lethal Weapon 5 actually needs to happen, but if we're to believe Donner's latest update, then it sounds like one last cinematic adventure for this beloved buddy cop duo are coming back for one last adventure. I guess they really aren't too old for this shit.