Two And A Half Men: Season 4, Episode 3

4 - 3: The Sea Is a Harsh Mistress

Charlie tries to surf to impress Dottie, a beautiful woman he just met, but after he nearly drowns he is convinced that he saw a vision of his late father, who tells him something Charlie finds worrying: he must take care of their mother. Title quotation from: Alan, explaining a possible reason Charlie drowned.