I hope no one saw that

This afternoon I was getting a pedicure.  I was very tired and just enjoying the relaxing moment,  as I sat there I heard a Vietnamese man having a conversation with another worker nearby and then he started laughing.  I suddenly became aware that I too was laughing like I was in their conversation!  I was so relaxed that when he laughed I joined in!  I don't even speak Vietnamese.  I quickly looked around and thankfully I don't think anyone noticed.