In his later years as a director, Billy Wilder made a lot of very adult films...filled with cursing and nudity. Part of this might have been because films in the 1970s and 80s were much more adult than the movies Wilder had been making in his heydays. Part of it, more likely, was that the aging Wilder felt that to be relavant he needed to be much more adult. All I know is that often the films he made during this era seemed very gratuitous...and even by today's standards, the language in "Buddy Buddy" is pretty adult. Now this is NOT to say I disliked the film...in fact, I think it's one of the best from this phase of Wilder's career.
Walter Matthau and Jack Lemmon star in this film and, surprisingly, Matthau plays a hitman! As for Lemmon, he plays a guy who is rather reminiscent of Felix Unger from "The Odd Couple"!
A mob trial is about to begin...and two of the three mob witnesses have been killed by a top assassin (Matthau). However, problems occur when he tries to off number three...as the neurotic Victor comes into his life. And, again and again, Victor accidentally ruins the killer's chances at making the hit.
As I mention above, the film is very adult at times...with some rough language and a subplot involving a weird sex clinic. But the weirdness of the film really appealed to me...it certainly WAS creative and original! And, fortunately, it's also darkly comical.