What cultural faux pas should I try to avoid making in New Jersey?

We asked people in New Jersey if they could share any humorous cultural blunders they commited. For new expats, keep in mind that these incidents are an inevitable part of expat life. Learning to laugh about them is the key!...

Other Questions:

•  What do I need to know before moving to New Jersey?
•  How do I find a place to live in New Jersey?
•  What is a typical expat home or apartment like in New Jersey?
•  What is the average cost of housing in New Jersey?
•  Should I buy or rent a home in New Jersey?
•  What should I pack when moving to New Jersey?
•  What cultural faux pas should I try to avoid making in New Jersey?
•  Why do people move to New Jersey?
•  What are healthcare services like in New Jersey?
•  What are medical services in New Jersey like?
•  What are typical rents in New Jersey?
•  What appliances are typically included in a rental?