4. Riggs & Murtaugh vs. Wah Sing Ku - Lethal Weapon 4
If this scene is supposed to be plausible, it's probably a mistake to have the two protagonists evidently be "too old for this s***", as Riggs (Mel Gibson) and Murtaugh (Danny Glover) certainly were when facing off against Jet Li's Wah Sing Ku. What Li lacks in English skills he more than compensates for with his educated feet, kicking the pair's asses in a handicap bout that still weighs in Li's favour given his age compared to his opponents. In fact, so much of a mismatch is this in terms of mano-y-mano combat that Riggs has to actually cheat, pulling out a freaking AK-47 and shooting Ku to death. I suppose better that than one of the old coots actually beating him to a pulp; Li's martial arts career would have died overnight.