When Tallest Son was in 5th grade, his class underwent the ubiquitous "drugs are bad" class presented by the local sheriff's department. Tallest Son - for whatever reason that would possess an 11 year old boy - stated to the cop and his entire class, including teacher: "My mom took cocaine while she was pregnant with me."
When he told me this at home that afternoon, I asked, "Did you also happen to mention you WERE ADOPTED?????" Er, no, he had not. Great for the next parent-teacher conference, let me tell you.
It's funny when I had two toddlers: one black and one a blue-eyed blond in the shopping cart at the store. The cashier looked at the blond one and said, "You look like your momma!" Then turning to the black child (my Eldest Son), said, "You must look like daddy." I muttered, "He must...."
When Tallest Son was getting ready to present his graduation speech a few weeks ago, he told me and Dear Husband that if he really screwed up, we had a great excuse. We could just whisper conspiratorially to people: "Well, you know he's adopted...." and just let that gently drift off, letting them draw their own conclusions.
My kids big joke now is that Dear Husband and I are going to sit them all down soon and tell them, "You know. We've been keeping something from you. You AREN'T adopted."
"What??? You're my 'real' parents? How could you do this to us??? How could you lie all these years???"