Someone going 'mama bear' or 'mama grizzly' in response to an attack, perceived or real, on their kids. Anything from refusing the child a second ice cream to full abduction gets this response. Can we all just agree that yes, most parents do love their kids and would do anything possible to protect them?
Running a close second are people who, when refused some child-related accommodation, respond with, 'But you don't understaaaaaand! I looooooove my kids!' The one that almost drove me around the bend was the woman who shared a workspace with me at a part time job - she used the space during the day and I used it at night. She covered the workstation with photos of her daughter, to the point where I couldn't use the keyboard or see half of the screen (this also tells you a lot about her work habits). So I would carefully remove the pictures and place them neatly in a safe spot on the desk, and every day she would wait for me at shift change to scream about how I must hate my son because I didn't cover my workspace with his picture, and it wasn't her fault if I was a terrible, unfeeling mother and I just didn't understaaaaaand...