My 6yo daughter was having a bit of a whinge yesterday and I started the "Right, young lady..." scolding when she cuts me off with "I'M NOT A YOUNG LADY! DON'T CALL ME THAT! I-AM-NOT-A-YOUNG-LADY!" (including foot stamping, arms crossed and bottom lip sticking right out). Luckily I was able to not laugh and reply with something along the lines of "No, I think you've just established you are a complete little sh1t".
A couple of years ago when I was explaining how Afghanistan is a muslim country and that muslims don't eat pigs, my son responded with "No bacon? None at all? How did you last six months without any bacon at all? That totally sucks, Dad".