A couple of years ago I bought myself a piano. The goal was to secretly learn to play the piano. Always been playing an instrument. I've played the clarinet and sax, I also play guitar. Playing the piano went well, soon I could play songs and even make up my own songs.
One day, when the people from my school threw this little get together at a local cafe, I did something amazing. Not amazing for me though, because I had it all planned out, but amazing for them to witness the thing I did. My eye caught a piano in the back. Pretending to be a new beginner I randomly started to play some tunes, gradually I built up my skills and did a little Mozart. They were confused.
I laughed and said "Guess I'm a natural."
They didn't believe me, so I told them the truth. But still thought it was amazing.