When I was checking in for my flight from Rio to Curitiba, I read my confirmation code to an airline employee. As I read through the combination of letters and numbers, I couldn't help but notice that the airline representative was chuckling.
I paused and thought for a second what she would be laughing at. As I looked at the code again, I noticed that it had the letter Q.
I guess I just assumed that you pronounce the letter the same as you do in Spanish (Kew, rhymes with Jew). In Portuguese, the word "cu" means asshole. I asked her how I was supposed to pronounce that letters. She said it is pronounced "kay." Then we proceeded to crack up together.
Now I know the Portuguese alphabet and have a great story to explain how I learned it.