My son was about 3 and I had to go to the bathroom in a public restroom so naturally I had to take him in with me. When I did he says in a loud loud voice..... Mom you've got fur! I didn't want to come out of the bathroom to see who had heard him.
My daughter was 4 and I had gotten her a set of twin dolls with carriages and bassinets to match which I had set up in the living room . When she woke up on Christmas morning and saw them she ran to them, picked the babies both up, looked up to the sky and said " Oh Santa Clause Thank you Santa Clause" What a memorable moment I will always remember.