What is hidden in 3D image?

Three priests died and came up to St. Peter at the Pearly Gates. St. Peter looked up the priests and informed them there had been a mistake; they were not supposed to die for another 10 years or so.
The priests were upset about this and asked St. Peter what could be done. St. Peter said that he would send them back to earth in any form they wanted until the problem was fixed.
St Peter asks the first priest, " What do you want to become?" and the first priest replies," I always wanted to be an eagle and see all of God's creation from above."
"Done." St. Peter snaps his fingers and the first priest disappears.
St. Peter asks the second priest, "What do you want to become?" and the second priest replies, "I always wanted to be a dolphin and see all of God's creation from under the sea."
"Done." St Peter snaps his fingers and the second priest disappears like the first.
St. Peter asks the third priest, "What do you want to become?"" and the third priest shyly says, ""Well... my wish is kind of sinful."
"No matter. You can choose any form you want." St. Peter says and the third priest replies, "Well, I always wanted to be a...stud, you know?"
St .Peter replies, "I don't see a problem with that." St. Peter snaps his fingers and the third priest disappears.
Later, Jesus asked St. Peter, " I heard there was a problem with three priests being here before their time. Where are they?"
St. Peter explained, "One is soaring high above the Grand Canyon. The second is swimming in the North Atlantic. The third is on the left rear tire of a Chevy Blazer."
- Joke shared on Beliefnet's Religious Humor page