We were eating at Winger's when my seven-year-old, watching the widescreen above my head, asked us, "Why does everyone jump on each other in football?"  It was then that I realized she's never seen football before!
Three-year-old:  "You don't want your little angel to get hurt/cold/hungry/lost/run over/etc..."
My two-year-old son began with"no" being the answer to everything, even when he meant yes. When he started saying "yeth," interrogations with him became much less confusing.  Then he went to a slow deliberate nod, no words...but the phase he's in right now is my favorite so far:  "Um...(pausing to think) sure!"  Dinnertime makes me laugh.  "Do you want more milk?"  "Um...sure!"  "Do you want more bread?"  "Um...sure."  You get the idea.
Seven-year-old:  "Mom, what is that stomping sound?"  (Mom:  "Oh, that's someone listening to loud music.")
Apparently my three-year-old didn't realize she was being quizzed on letter sounds by her big sister because when asked, "What sound does B make?" she said, "Bzzzzzzzzz...."
Two-year-old:  "MOoooOm; Wheh ah you?"  Or when I call him he often says, "I comin'!"  (I guess it's good we don't live in a bigger house, yes?)
My six-week-old baby now gurgles and goos and sometimes even says "Wow."  He always talks to me with a smile on his little lips.  Wouldn't it be nice if everyone did that?