Mom of two, Mayim Bialik (Blossom, Big Bang Theory), recently shared some experiences from what she calls the "Family Road Trip From Hell" on Kveller.com. In one amusing anecdote which she refers to as "The Pasta/Ketchup Incident," she describes the "holy fit" her son, 3-1/2 year-old Fred, threw when he couldn't have ketchup on his noodles.
While it's not at all unusual for a 3-1/2 year-old to throw a fit, it just so happens that Fred was born when the sign of Virgo was rising, making Virgo the sign of his Ascendant, and during the period of time that the family was on the road trip, Mars was traveling over the same space that marks Fred's Ascendant, giving potential to have it triggered (or shall we say, detonated?!)
Mars is a planet of will, action, and aggression, and its presence encourages us to go after what we want, pushing at boundaries and exercising our sense of power. For a 3-1/2 year old, it's not about strategy, but immediacy: I want!