I have to say, there's just something fun or comforting about listening for Wilhelm in the action movies I watch. Today's entry into the competition is Captain America: The First Avenger. There is a website that lists the films the Wilhelm Scream is heard in, but it's not complete.
Here's an article about its origin and use and a plea to stop using it. Honestly, it makes me grin. It doesn't take me out of the movie at all. I love hearing it. My friends and I look forward to it in the types of movies it ends up being used. Apparently its usage is waning due to overuse. One day I may never be able to hear Wilhelm in my movies again because some people have no sense of humor. By then, those professed "film buffs" will have found another fun thing to have conniptions about. So I guess I will enjoy Wilhelm while I can.