Up in Smoke (1978)
Cheech and Chong's first full-length movie is straightforward stoner slapstick. The duo smoke up, veer into the real world, and wake up under the thumb of the law. They smoke at home, they smoke at concerts, they smoke in their "Love Machine" Chevrolet Impala, they smoke in court. Small joints, big joints, oversize clown joints: anything goes. And when lawmen come a-knockin', Cheech and Chong smoke their way out of danger. Over the last 40 years, stoner comedies have gone soft compared to Up in Smoke's rambling sense of defiance. Really, there's never been a more carefree attack on the establishment than these two desperately traversing Los Angeles for a good hash.