Mouthwash

My 5-year old boy wanted to try mouthwash. So, I put a little bit in a paper cup for him and told him to just swish it around in his mouth and then spit it out. I warned, "but don't swallow it or you'll throw up...".
So, sure enough - he swallowed it. Leave it to kids.
He didn't say anything for about 5 seconds, but he had this really worried look on his face. Then he said in a very worried little voice, "Am I going to throw up now?"