It's a groaner too...
In the old days before the fall of the Iron Curtain, a Czechoslovakian scientist and a Russian scientist were working on a theory about bear behavior, but in order to complete their work they would have to travel to the US in order to study Grizzlies in their native environment. What with political problems and communist red tape they are forced to wait for years before they are allowed to get travel visas to the US.
Finally all the paperwork comes through and they are on their way to Yellowstone park.
When they arrive they are met by Park Rangers who inform them that they cannot be allowed to camp in the bears territory because the bears are simply too aggressive.
Naturally having spent so much time and effort and being so close to their final goal, they refuse to be talked out of it.
After much argument with the rangers they finally come to an agreement where the rangers will set up their camp and check up on them every morning to make sure they are safe.
For the first week everything goes well and the scientists are wildly enthusiastic about their findings.
One morning the Rangers show up at the campsite to find the place completely torn up, with bear tracks and blood everywhere and no sign of either of the two scientists.
One of the rangers after examining the tracks tells the other that they are looking at one male and one female adult grizzly bears, most probably a mated pair.
Reluctantly the Rangers load their rifles and set out to find and kill the bears.
After a brief search they come across the trail of the female and quickly corner and shoot her. When they open the stomach they find the remains of the Russian scientist.
One ranger looks at the other and says "Well, I guess you know what this means don't you?"
"The Czech is in the male."
Badum kish!
