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

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