The formula of parenthood is:

T = CPV

C = child’s reaction to sibling snatching or sibling teasing, non-serious injury, or not getting the right color plate or whatever it is he/she must have at that exact moment
P = your mood
V = a variable to capture all variables such as the weather, traffic, the passive aggressive remark your neighbor, boss, or mother-in-law said that morning
T = your tantrum. You will start with words, maybe even some profanity because honestly the child will not comprehend anything you are saying, that will be spoken with increasing volume which will devolve into hand gestures, vein popping, foot stamping and door slamming. You will blame all external factors (V) that has led to this moment, blame your husband and his role in raising this hell-spawn child, attempt to comprehend why a child cannot comprehend, curse your child because at this point he/she is no longer a child but an adult with purposeful intentions, then berate yourself for cursing your child and being a terrible parent.

Strength and severity of T will vary. Who says math is an exact science?