One that I wish I could stop saying...
"Is that a challenge?"

"Cut the blue wire."

That reminds me, "Of course i cut the power first". Good thing i was standing a wooden table... Remember people, turn off the main switch before connecting something to the mains

"Mom, give me, there, a whole that's hanging." (pointing to a hanging water glass holder, like this http://www.giftag.com/clip/mygiftee/berry-tea-glass-holder-wedding-gifts-mygifteecom-clip.jpg but not that decorated.)

"Can I have your car?" (flustered, to my what i then considered a crush(puppy love).)

"Is this yours? Maybe it fell out of your window." (pointing to a pile of money someone probably lost that was right in front of one of the kiosks.)

"But, what about the dinosaurs?" - My seven year old pre Atheist self in the middle of church.