Dsky - get yourself a "debit card" from your bank THEN use it at stores like a credit card. If they ask credit or debit? Tell them credit.
1st) you get to use it with the IDIOTS looking for change and you have your usual "pocket weights worth"
#2) When you use it as a credit card - you don't have to use a PIN#, just your signature - BUT the revenge factor = it costs them the headaches of reconciling because there's a debit card in their credit card tallies + it costs THEM not YOU the bank processing fees.
If they want to hire IDIOTS it's going to cost them