Duuhh!!

Three construction workers are sitting on top of a building and take a lunch break.
The first one is a Romanian, the second a Belgian and the third one a Moldavian.
The Romanian opens his lunch box and says: Oh no! Again cheese! It has been cheese for the last ten years. If I get cheese tomorrow I jump from this building.
The Belgian opens his lunch box and says: Oh no! Again ham! It has been ham for the last ten years. If I get ham tomorrow I jump from the building to.
The Moldavian opens his lunch box and says: Oh no! Again jam! It has been jam for the last ten years. If I get jam tomorrow I jump from the building to.

The next day at lunch.

The Romanian opens his box and sees the cheese. He says goodbey to the others and jumps.
The Belgian opens his box and sees the ham. He says goodbey to the Moldavian and jumps.
The Moldavian opens his box and sees the jam. He shakes his head and jumps to.

Later that day the three wifes of the workers are there to identify their husbands.
The Romanian says: if I would have known about the cheese I would have given him ham or salami!
The belgian says: if I would have known about the ham I would have given him cheese or salami.
And the Moldavian says: And I couldn't know because he was making his own lunch for the last ten years.