Revenge on My Greedy In-Laws

My brother-in-law, driving my BMW, tossed me the keys: 'Sister-in-law, go fill up the tank.' I refused. My mother-in-law slapped me. My husband said: 'The car belongs to our family, what's the big deal?' I picked up the keys. But I didn't drive to the gas station. Instead, I headed for the city's largest used car market.