When someone asks DS4.5 the question "How do you know that?" his usual answer is "I'm just smart!". We did NOT teach him that. He somehow decided that that's how it is and I usually want to hide under the nearest rock or other cover. I tried to explain to him that he shouldn't say that but all he said was "why? I AM smart!". Hopefully as he grows older he can also keep his mouth under control a bit more! lol