Foreign-language pun, a true story.

I don't speak Spanish, despite hispanic heritage. I have nonetheless picked up a bit.
While attending Mass in Spanish one Sunday, the lector read:
"Oh Dios, crea en mí un corazón puro."

But what I heard was
"Oh Dios, crea en mí un corazón burro."

It took me a second. I thought, Why would I want God to give me the heart of a donkey?
Then I realized, of course, it was pure ("puro"), not donkey ("burro").

Anyway, my Tejano friends had a good laugh at my expense when I told them about it.