Cinematic Americans cross the border for myriad reasons: to unwittingly liberate a village with their theatrical abilities, to chase down an ornamental pistol with a deep folklore, or to tell a cartel chief what’s what. Off the screen, our Noah Ballard went to Mexico for the pools and the margaritas. This week, he calls in with his old pal Brent to discuss ¡Three Amigos! (1986), The Mexican (2001) and Traffic (2000). As goofy as singing shrubbery and as serious as a failed war on drugs, this is “Americans in Mexico.”