Ways a four-top can piss off a server

1. Order only 4 waters to drink.
2. Order only 4 half-priced specials to eat.
3. Interrupt your server while he's with another table.
4. Shake your raised, near-empty water glass several times at him to non-verbally indicate that you'd like some more.
5. Ask for 4 separate checks after your check's already been printed.
6. Do the "took you long enough" eye-roll/sigh when your server returns with your separate, voided & re-rung checks.
   
7. Have all 4 members of your party pay in cash anyway.
8. Tip under 20%.

Doing any one of these alone would be enough to piss a server off. Doing all 8, though, in one visit, is like painting the Mona Lisa of douche-itude. Fucking assholes.