Withnail & I

Withnail & I (1987)

Two out-of-work actors -- the anxious, luckless Marwood and his acerbic, alcoholic friend, Withnail -- spend their days drifting between their squalid flat, the unemployment office and the pub. When they take a holiday "by mistake" at the country house of Withnail's flamboyantly gay uncle, Monty, they encounter the unpleasant side of the English countryside: tedium, terrifying locals and torrential rain.

Synopsis via TMDB