The Farmer and the Nortdakota Cow

Ole is a farmer in Minnesota. He is in need of a new milk cow and hears about a nice one for saleOver in Nortdakota (that would be 'North Dakota ' for you Non-Scandahoovians out there).
He drives to Nortdakota, finds the farm and looks at the cow. He reaches under to see if she gives milk. When he grabs the teat andPulls, the cow farts.
Ole is very surprised. He looks at the farmer who is selling the cow. He then reaches under the cow to try again. He grabs another teat, Pulls, and the cow farts again.
Milk does come out however, so after some discussion with the cow'sCurrent owner, Ole decides to buy the cow and take it home.
When he gets back to Minnesota, he calls over his neighbor, Sven, andSays, "Hey, Sven, come and look at dis here new cow I yust bought. Pull her teat, and see vat happens."
Sven reaches under, pulls the teat -- and the cow farts. Sven looks at Ole and says, "You bought dis here cow in Nortdakota,Didn't yah?"
Ole is very surprised since he hadn't told Sven about his trip. Ole replies, "Yah, dats right. But how did yah know?"
Sven says, "My vife is from Nortdakota."