Things we put in our mouth

We were talking to Nicholas yesterday about things we put in our mouths, and I told him, "We don't put boogers or candles in our mouth. Only food and drinks like milk, juice and water." And he said and lemons. I have no idea where the idea about eating lemons came from, but laughed and said, yes, and lemons. We've had issues lately with putting things in our mouths, like the tealights I have on our coffee table and picking his nose and eating the boogers (yuck!). But I thought this was a funny story.