Everyone likes free things, and everyone likes drinking. Combine the two and you've got one happy hour. You will need no expectations, a smile on your face, basic common courtesy, and some money. Never ask for a freebie. It doesn't work, and since most bartenders have good memories, you'll always be known as the cheapskate. Be polite
Not bothering to say "please" and "thank you" drastically decreases your chances of a free drink. If the bartender is really tied up, don't bug him. Waiting patiently is another way to get into his good graces. Be fun & engaging. When ordering, be fun and engaging. If you're memorable (in a positive way!), chances are your wit will be rewarded.
Keep a smile on your face—even when you're annoyed at being unable to catch the bartender's attention. Compliment your bartender. Flattery works! Don't expect a freebie. Don't behave like you're expecting a freebie. Always have your money in hand, ready to pay. Never tip less than a dollar, and round up larger tips to whole-dollar amounts. Bartenders hate dealing with small change. Tip generously. Bartenders remember the biggest—and the smallest—tips. You take care of him, and he'll take care of you. *Fact: The word "tip," which originated in 17th-century England, is an abbreviation of the phrase, "to insure promptness."