Caelin's cheerio trophy

We have been teaching Caelin to do the sign language for "more" when wanting food these last few weeks.  She has caught on quickly, and is so smart.  Cade has joined in and likes to remind her of how it goes.  Tonight, when Caelin signed "more" for a cheerio, Cade told her (2 seconds after I stopped recording on my phone, bummer!), "Congratulations Caelin, I hope you get a trophy!"  I almost died laughing and asked him, "What kind of a trophy would that be?"  Cade replied very matter-of-factly, "A cheerio one that says 'Congrats YEEE HAAAAWWW!'"  Where does he get this stuff from?