對於貪小便宜的人...

請問一下什ㄇ付稅阿?

1. pay before ur firend paid and leave, so u don't need to care they pay less.
2. get the bill first when waiter put on the table and calculate each one who have to pay, tell them they should pay this amount, if they don't believe, tell how u calculate
( I do this way, becasue I had same situation with u many times)

我以前也有一個學姊喜歡買飲料或小東西的時候(通常金額都不太大)說:你先幫我付一下,我回去在還你.因為是小錢.就算他一直拖也不太好意思一直跟她要.
結果久了我們才發現這是她敲竹槓的方式.
治這種人的方法就是:大膽跟她要,就算明知要不到,也要一直提起,是你的錢,所以沒什麼不好意思的.
下次就算她又要佔別人便宜,也會先考慮不要找你當對象!

專科時有個男同學也是超會貪小便宜的
比如，我去便利商店買水喝
一瓶18元，我付20元，他不但把我的發票拿走
又把找剩下來的2元也A走，水喝完了，
他還說要空保特瓶，因為那一個可回收0.5元
哇咧!!嚇死我了....

Bring a calculator with you so that you know exactly how much 'you', not your friend, need to pay, then the rest is what s/he needs to pay.
I used to eat out with my Japanese friend, and we did this way.