If you come to NYC, you might be tempted to take a pedicab ride where a strapping young man (and sometimes women) peddles you from destination to destination for a goodly sum. It’s an interesting way to get from place to place for short distances. (I wouldn’t jump in one in Manhattan and ask them to peddle you to JFK.)
If you do, you should — they feel — know something about tipping and since I like to be of service to my fellow humans, here is a sign I spotted on a pedicab with the ‘suggested’ tipping scale.
I once saw a waiter in Friday’s wearing this button: “Tipping is not a city in China”. I indeed gave him a nice tip. Sometimes sublety works better.