When visiting Frankfurt, be sure to follow certain etiquette rules. Germans value punctuality, so it is considered rude to be late for meetings or appointments. It is customary to greet each other with a firm handshake. Always use formal titles until you are asked to address each other by first name. It is also polite to take your hands out of your pockets when talking to someone and to remove your hat when inside. In restaurants, a 10-15% tip is customary. Remember to respect the local culture and the public, quiet atmosphere.