Good faith effort, no guarantees

This is almost certainly April Fool's joke, but it's a good story that raises a number of issues and will certainly get students' attention.  It beings like this:

In Stuttgart, Germany, a court judge must decide on a case of honorable intentions in a situation where a man hired his neighbor to get his wife pregnant.

See if you can spot the mutual mistake issue . . .

[Frank Snyder h/t Wayne Barnes]