Up in Smoke (1978)

Tommy Chong plays Anthony Stoner (though in the final credits the character is listed as 'Man'; his name is used only once: during the scene of his father - played by Strother Martin - berating him, his mother - played by Edie Adams - calls him "Anthony"), a jobless hippy who is kicked out of home by his father and manages to trick Pedro (Cheech) into picking him up off the side of a highway by posing as a woman with large breasts. They both share a large joint (Spliff) (which Chong's character says is made with "labrador", marijuana and dog feces, due to his dog having eaten his stash) and are arrested when a police officer discovers them to be stoned. After their subsequent trial (where they get off on a technicality when it's discovered the judge is drinking vodka), they are released, and in an attempt to procure some marijuana they visit Strawberry (Tom Skeritt), Pedro's cousin. They narrowly escape a police raid on Strawberry's house, but are soon deported to Tijuana by the Immigration and Naturalization Service, together with Pedro's illegal immigrant relatives (who just want a free ride to a wedding).