Splitting a bill 30 ways, especially after it’s been delivered
Most servers are happy to split a bill up; just give them a heads up before you order. Other places don’t allow split bills, so have cash on hand. Otherwise, you’re forcing a server to do math that would give Archimedes a headache.Linger during a dinner rush
There are dozens of people waiting. Maybe you should show your friends pictures of your dog in costumes somewhere else, instead of filling up on water like a camel while starving people drool over your table.

Say, “Oh, I didn’t like this — can I get something else?”
You ordered the miso-glazed salmon before realizing you like neither miso nor salmon. And you hate hyphens. If you want little nibbles, hit up a tapas bar or Old Country Buffet.

Slip him/her your number
Classic, classy move, Robert Browning. If she wanted to see you in a situation where she wasn’t being paid to be nice to you, she would have given you her digits.Write a message on a receipt in lieu of a tip
“You look great today” isn’t gonna get anybody a post-work drink, or, you know, food for their kid. And “the service was terrible” isn’t going to get you any further away from the gates of hell. If you aren’t gonna tip, the lack of money will make your point.

Tip in change
Unless you’re packing a handful of quarters or Sacajawea dollars, nobody wants to deal with the contents of your car’s cup holder, especially your sticky-ass pennies.Ignore the list of ingredients, then send an order back because you have allergies
You have celiac disease and you just ordered a sandwich on sourdough with a side of bread pudding and a Hefeweizen. You don’t get a re-do on that.

Use a Groupon, then give a discounted tip
Getting a meal for 50% off doesn’t mean the service is also discounted.

Snap, scream, or whistle
Unless you’re an unfrozen caveman, this is an unacceptable mode of communication.Say you’re friends with the owner and expect special treatment
This is an especially bad idea if the owner is a prick. Unless you can produce a full back tattoo of the owner, your so-called relationship is dubious.

Order off-the-menu items
Yes, they have fish. Yes, they have rice. No, the folks at the Italian place aren’t gonna make you sushi with risotto. So don’t ask.

Send a half-eaten entree back
“Oh, this is overcooked,” you say, as you slide a half-eaten steak and missing sides over to the server. Was the other half medium-rare?Blame the server for everything
You are aware the server didn’t make your food, right? Or set the hours of operation? Or price the menu? Or clean the plate? Or forget to put a gluten-free option on the menu (seriously, enough with the gluten!)? She’s also not the complaint box. Direct your rage elsewhere, Dr. Banner.

Leave literature of any kind
A pamphlet about the virtues of living a Godly life might be enlightening, but pamphlets don’t put money in the ol’ tithing basket. And nobody wants to see your post-hardcore slowcore band, so save that flyer for a telephone pole.

Order while on the phone
These people are also likely to yammer throughout dinner, and can’t figure out the correlation between talking to their wife and their burger coming with honey on it.Show up for a big table 30mins before the rest of your party
You get in. You get a table for 10 right at 6p. Then you sit there, alone, for 30mins while the restaurant has to turn dozens of people away. And the server feels too sorry for you to ask you to leave. Your pouty eyes and a-hole friends are costing her, and the restaurant, tons of money. Make sure to leave a nice pamphlet when you go.