Your story reminds me of when my oldest was about two years old. She was being looked after during the day by an older lady and her husband. At lunch one day the husband spilled some soup and my daughter says "Uncle, you're making a bloody mess". Now, the day care lady brought this to my attention when I picked my daughter up, and for the life of me, I couldn't figure out where my daughter had picked that up, could it be my Dad?. I said "Hm, I never say that but I'll discuss it with my wife". Well, my wife informed me that "bloody" was a favourite word of mine and I apparently didn't even know it! Oops.