Here's the study RedWolf. Sounds like it's a really good idea to give each member of the dinner party a piece of candy and then another.RedWolf said:I saw a study once that said that waitresses that touch the customers (her hand on your arm breify for example) get consistently higher tips.

Cornell University's Center for Hospitality Research has conducted several studies revealing some interesting facts about server habits that can boost tip percentages. Here are a few of them:
Spoiler :
Touching - Waiters experienced a tip increase from 11.8% to 14.8% of the check total when they briefly touched the shoulder of the customer. Both men and women left higher tips when touched, and although younger customers increased their tip amount more, all ages increased the tip by some amount.
Squatting - Two studies showed that waiters who squatted next to the table when taking orders and talking with customers increased their tips from 14.9% of the bill to 17.5% of the bill in one study, and from 12% to 15% in another study. Apparently, the eye contact and closer interaction creates a more intimate connection and makes us want to give the server more money.
Giving candy - A study that involved giving customers a piece of candy with their bill showed an increase in tip percentage from 15.1% to 17.8%. Another study in which servers gave each customer two pieces of candy with the bill increased the tip from 19% to 21.6% of the bill. Still another study showed that the way the server gave the customer the candy had the largest impact on the increase of the tip: This study had the server initially give each member of the customer's party one piece of candy and then "spontaneously" offer a second piece of candy. This method increased the tip to 23% of the bill!