Etching Sand Castles on a Single Grain of Sand

This is so cool!  Plus I love that the one guy's name (Coelho).  One time, Peter and I were with his friend getting açaí in Sao Paulo, and I was still learning my Portuguese vocabulary.  I held up a spoon and said, a little too loudly, "Coelho!"  Peter and his friend cracked up laughing, and I had no idea why!  I was so proud of myself for remembering the word!  Peter and his friend kept laughing and finally told me that I had just called my spoon a bunny.

(In my defense, the word for spoon and bunny are similar!  Spoon = colher, bunny = coelho)