If we're going to talk about sexual innuendo, let's skip the small stuff (that's what she said, hyuk hyuk), and talk about the most famous example.
Original Ending to be Inserted Back Into Alfred Hitchcock’s North By Northwest (http://reel3.com/north-by-northwest-the-original-ending/)
Do note the article's date, BTW. Still, it was a funny way to introduce this scene to the thread.