The Vietnam people are so friendly.
I'm in HCMC with my partner, I'm from Australia and she's from Peru. Every time we go for a walk in the street lots of little kids will wave at us shyly and when we wave back they will light up with the biggest smiles yelling "Hello hello hello!" We have had all sorts of interaction from people and kids waving, friendly hello's, people asking for photos with us and older people grabbing one of my hands with both of theirs.
I've traveled to a lot of countries and have never experienced anything like this. Very interesting and lovely people.