a sketch on my birthday

It was my birthday yesterday. I received a bundle of joy bouquet from my 14-year-old son who is very good with wires and papers. We went to "Casa do Churrasco Brazil" - a Brazilian restaurant for my birthday dinner. I did a sketch after the fantastic dinner and it was done directly on the dinner paper that already filled with some drops of oil and sauce. The waiters and waitress were very surprised when I showed them the sketch as we made our exit.