The Three Amigos are Lucky Day (Steve Martin), Ned Niederlander (Martin Short), and Dusty Bottoms (Chevy Chase).
Set in the silent movies era, they a band of Hollywood heroes who unwittingly answer a small Mexican town's newspaper ad for a hero strong, brave and ruthless enough to tackle the resident gangster, El Guapo, thinking it's a gig.
Watch what happens when they roll into town on assignment...
Ah, what a classic! Kills me every time.