When a person gets a brand new pair of shoes and they at all costs avoid activities that could damage or stain the pair.
The victim will take extreme measures to protect their shoes, sometimes going as far as harming others.
The effect usually wears off after the first few scuffs and stains, or after a month or two.
Person 1: "Sorry man, I can't go hiking this week, I got the brand new $700 Jayden 4's and I'm all out of plastic shoe covers"
Person 2: "Damn, you must be suffering from New Shoe Syndrome"
Person 1: "You don't understand mate, these are more valuable to me than my family"