We all went out for dinner last night to celebrate a raise I got at work. 
During the dinner conversation between my wife and I my son, 5 years old mind, blurts out the following in a restaurant:
“Mom, that light looks like a nipple!”
My wife was overcome with a fit of the giggles at this. I was a but shocked, and didn’t readily believe that he actually said that. When we didn’t answer him on his comment, he repeated it. Louder. We told him that standard “Thats nice dear” lines.
I think it is, at times embarrassing, it is quite often highly interesting and entertaining what comes out of the mouths of children. Then don’t have the speech filter that comes with age and maturity, so you can almost never be prepared for what they may say.
Just make sure that in any conversations you have, be sure that little ears aren’t listening. And especially dont mention “nipples” as this apparently sounds like a fun word to kids.
-Cheers