Kill Cruise aka Der Skipper (1990)

Now here's a bit of eurotrash for you -- a mainstay of German TV -- made there I think.  The lead is Juergen Prochnow who is an excellent actor and who should have known better than to team up with Elizabeth Hurley and Patsy Kensit who play feckless friends tarting it up in Gibraltar -- their "nightclub act" has to be seen to be believed.  Anyhow he is a captain of a small vessel and agrees to sail them to Barbados.  En route he starts an affair with Hurley which sends Kensit 'round the twist until the action takes a totally unexpected turn which comes right out of left field.  I think "stupid" describes this film best.