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 retiring in New Jersey?
•  How do I meet people in New Jersey?
•  What is life like in New Jersey?
•  Is there a lot of crime in New Jersey?
•  Is there a lot of diversity? Are people in New Jersey accepting of differences?
•  What are the schools in New Jersey like?
•  Is the cost of living in New Jersey high?
•  What advice do you have for expats having a baby in New Jersey?
•  What are healthcare services like in New Jersey?
•  Is the cost of living in New Jersey high?
•  What type of recreational facilities are in New Jersey?
•  What is the weather like in New Jersey?
•  Are there good restaurants in New Jersey?
•  Where will I buy groceries and do other shopping in New Jersey?
•  What are the visa & residency requirements in New Jersey?
•  Are healthcare and health insurance expensive in New Jersey?
•  What do I need to know when buying property in New Jersey?
•  Are foreigners allowed to own property in New Jersey?
•  What appliances are typically included in a rental?