What freaks people out is having a bird put together a complete, grammatically-correct English sentence, which is appropriate to the specific circumstances of the moment, having never strung those words together before.
Nobody ever believes it when I tell them about it (they seem to consider parrots as feathered tape recorders), until they finally experience it for themselves. The look on their faces is priceless - that gawking, gaping, deer-in-the-headlights look of utter amazement. Initially, they want to write it off to coincidence. Once they experience it a few more times, they become true "believers".
I have to admit, before we got our CAG "Reno", I was a tiny bit skeptical myself, considering that a lot of what I'd heard was exaggeration. Wow, was I wrong!! When something unusual happens, and he tilts his head to one side & fixes us with that enigmatic stare, we know he's about to say something new, situationally appropriate, & amazing. We're rarely disappointed...