it was one of them days yesterday - long story very short, we were in the car early evening, and DD 2.6 was in the back, whinging/crying and just pointing to random stuff going "that's mine" "that's mine" ina really horrible whingey voice constantly...honestly it was like a broken record.
After 20 minutes or so of me trying to figure out exactly what it was she wanted, and massive screaming fit when i got it wrong - we seemed to calm down, until 5 minutes later she started again which resulted in me saying "ENOUGH of the whinging, either tell me what you want nicely or you can sit there quietly but i have it with it whining". i didn't shout, but i didn't exactly use my lovely mummy voice either..
anyway her face when she looked at me - she did stop and was wonderful for the rest of the journey - i however feel like utter shit as i keep seeing her little face when i "shouted" at her 
our little ones sure know how to press our buttons and make us doubt ourselves lol x