10 things never to do or say to your waitress/waiter.

1. Never blame the food being slow on your server. NEVER. It's not like your server is the one cooking it, and no, just because they bring out the food for someone else, does not mean that they did not take your order down. Some food take faster than others to prepare, so sit your ass down and wait.
2. We do not care how much money you have, really. We couldn't be bothered how much you're spending, and we do not care to have you shove that fact into our faces every time something goes wrong. We couldn't give a shit how much money you have. Treat us better, we'll make your short stay at the restaurant a whole lot better. We will clear your empty plates and glasses, and change your ashtrays, ice buckets and mixers for you without asking. Treat us like shit, and everyone avoids you like the plague and you would have to keep calling us to do something for you, and to the other patrons, you're probably going to seem like you're needy.
3. Don't you dare order a cocktail and say "I can't taste the alcohol", or "do you think  you can ask your bartender to add more alcohol in there?" No. We cannot, and we will not. You ordered the damn cocktail, you drink it. It's cocktail. Mixed with a few different kinds of juices to dampen the taste of alcohol. If you wanted a drink that's stronger, order something on the rocks, or neat, or a damn beer. Even order a bottle. You could also ask us to add an extra shot to your drink, and you pay for it. If not, quietly sip on your cocktails.
4. Do not snap, clap or whistle to get our attention. We aren't animals. Wait for us to realise you need attention because more often than not, we're always walking around. I'm sure you can wait 30 seconds for us to walk around your table area, and if you can't, walk up to us. Dining in a restaurant doesn't automatically make you handicapped. It will not kill you to walk up to us and request for whatever you need. We will graciously do it for you, apologise for making you walk, and even give you smiles the entire time.
5. If your buddies and yourself decide that you guys are going on dutch, tell your server. Nothing sucks worse than putting it all on one tab, and having you idiots tell us when you want to get the bill that "oh, we want to split the bill." No. It greatly irritates us because we have other customers to attend to and we will not spend that 15  minutes splitting the bill between you 5 idiots, and then have you idiots come up to us and complain that we're taking too long. What's worse is when your server asks you who had what, and you can't remember. You can't remember what you had, and we're supposed to remember what all 5 of you had? We are servers, not robots. Remember your own damn meal or just split even by yourselves.
6. When we politely apologise for interrupting your conversation, and ask you a question, do not ignore us. Chances are we're asking if you want a refill, or that we're doing the last order for food, or for drinks. If you blatantly ignore us, we will act like you don't exist, and if you complain that we didn't inform you, we will throw the fact that you ignored us back in your face.
7. We're human. We make mistakes too. Sometimes we charge you the wrong amount, sometimes we spill your drinks. On you. We're not complete assholes unless you're one. We will replace your drink with a new one. We will apologise and re-charge your bill, because, believe it or not, it's fixable, and not that difficult to do.
8. Do not do a dine and dash. Never. Do. That. All that food and drinks you were supposed to pay for? That's coming out of our pockets now you idiot. We work because we can't afford a lot of things, and more often than not, we're supplementing our own pocket money, sometimes even school fees. To fork out that 50 over dollars that you were supposed to pay, is a lot for us. 
9. Don't ask us if we can "change the music". No we can't. It comes from a fixed playlist that we have no control over. The bosses don't like it, the manager doesn't like it, and we don't like it.
10. In Singapore, it isn't mandatory to tip the waiters and waitresses. Sure, a tip would be wonderful, but if you don't tip that's fine. Just don't make life difficult for us, and try to be a little nicer to us. We're there to serve you, make your meal as pleasant as we can. Do not treat us like your slaves. You aren't paying us, and we will refuse to serve rude customers.