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

We asked people in Missouri 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 should I pack when moving to Missouri?
•  Where should I setup a bank account in Missouri?
•  Will I be able to find a job in Missouri?
•  What is life like in Missouri?
•  What do expats in Missouri appreciate most about the local culture?
•  What do expats find most challenging?
•  Is there a lot of crime in Missouri?
•  Is there a lot of diversity? Are people in Missouri accepting of differences?
•  What are the schools in Missouri like?
•  What are healthcare services like in Missouri?
•  What are medical services in Missouri like?
•  Are healthcare and health insurance expensive in Missouri?
•  What are emergency services like in Missouri?
•  Will I need to travel to see a specialist?
•  Are common prescription medications available in Missouri?
•  How are local medical facilities in Missouri?
•  As a foreigner living in Missouri, will I have access to public healthcare? What is it like?
•  What have your experiences during the pandemic with the local healthcare system been like?