A Father and son are talking about where to go on holiday.
The father suggests Poland because you can eat and drink for free.
Also, he says, you may go to the buffet for free.

After his visit to Poland his son lies in the hospital and complains
bitterly, Why have you told me all this is free in Poland. Everytime I
tried to have lunch for free or tried to go to the buffet for free I was
beaten up.

After his father had a careful reflection he says,
Oh, sorry. I didn t tell you I was in Poland with the SS!