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Perhaps the most notorious celebrity cheapskate ever, the "Mad Men" star makes plenty of money playing Pete Campbell on AMC’s hit show, but you wouldn’t know it by visiting his house. Kartheiser had an epiphany in 2010 and started purging his life of physical possessions — he lives in a tiny bungalow in Los Angeles with barely any furniture. He gave away his toilet and one point had to go over to the neighbors’ to use the bathroom. Up until 2012, Kartheiser didn’t even own a car, instead choosing to take public transit to get around. And that’s a serious commitment in L.A., where even toddlers drive around. He’s also a vegetarian for ecological reasons.