Surprise! It’s 123456!

Dark Helmet: So the combination is… one, two, three, four, five? That’s the stupidest combination I’ve ever heard in my life! The kind of thing an idiot would have on his luggage!
[next scene]
President Skroob: Did it work? Where’s the king?
Dark Helmet: It worked, sir. We have the combination.
President Skroob: Great. Now we can take every last breath of fresh air from Planet Druidia. What’s the combination?
Colonel Sandurz: 1-2-3-4-5
President Skroob: 1-2-3-4-5?
Colonel Sandurz: Yes!
President Skroob: That’s amazing. I’ve got the same combination on my luggage.
Dark Helmet, Colonel Sandurz: [looks at each other]

— From Spaceballs