Sven was going for his morning walk one day when he walked past
Olie's house and saw a sign that said "Boat For Sale."

This
confused Sven because he knew that Olie didn't own a boat, so he
finally decided to go in and ask Olie about it...

"Hey Olie," said Sven, "I noticed da sign in your yard dat says 'Boat For
Sale,' but ya don't even have a boat. All ya have is your old
John Deere tractor and combine."

Ole replied, "Yup, and dey're boat for sale."