I was at someones house for Yom Tov and I mentioned I knew Spanish. One of the Kids wanted to show me the spanish that he knew. He said the School Janitor taught him some Spanish.
Needless to say I was shocked what the Janitor taught him, they were not words a yeshiva boy should know and his mother would have slapped him had he said it in English.
I am willing to be the Janitor thought it was funny to teach some jewish kids some bad Spanish words figuring the parents did not know what they were (or the kids)