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A monoplane with a sign reading "Go Ducks!" flies overhead of Oregon State's commencement on Saturday.

(Tweetpic by @TheQuackMamba)

There is no ceremony too sacred for the Oregon-Oregon State rivalry.

During Oregon State's graduation ceremony held in Reser Stadium on Saturday, a monoplane dragging a sign that read "Go Ducks!" flew overhead.

Curtis Anderson tweeted Ann A. Kiessling, Oregon State's commencement speaker, upon seeing the message, responded with "Go Beavs!"

Details about who flew the plane are unknown.

What hijinks are in store for Oregon's commencement on Monday?