Drinking
I was talking to a friend of mine the other day, she is a blonde girl who had spent some time in Japan. On her first night there she and a friend, another blonde girl, had gone down to the bar in the hotel for a gin and tonic or two. The first round arrived, ice cubes chinking, lemon floating, a bead of condensation running down the glass. They raised their glasses in toast to each other and with a refined "chin chin" set about the business at hand. Almost immediately they were surrounded by happy smiling Japanese men who insisted on buying them more drinks and they sat late into the night drinking and saluting their new friends with a cheery "chin chin" with each new round of drinks.
It was only a few days later that they discovered that in Japanese the word chin means penis.