Premise: Lethal Weapon 4 is a 1998 American buddy cop action comedy film directed and produced by Richard Donner, and starring Mel Gibson, Danny Glover, Joe Pesci, Rene Russo, Chris Rock, and Jet Li (in his American film debut). It is the fourth and final installment in the "Lethal Weapon" series.
Hypothesis: There are more films in the "Lethal Weapon" series after Lethal Weapon 4.