If someone asks you a question your answer is always “no.”

“Do you know the time?” “No”

“Do you want a free bottle of designer perfume?” “No”

“Can I ask you a question?” “No”

“Do you want to help starving children?” “No”

“My name is James, what’s your name?” “No”

There’s no upside to interacting with people on the street. Don’t be polite because they’ll use it against you.