I have seen this in several e-mails and I just checked snopes (they said it was true) about buying fresh bread.
Bread is delivered fresh to the store 5 days a week (Mon., Tues., Thurs., Fri., & Sat.) and each day has a different colored twist tie (or plastic closure).
Mon. - Blue
Tues. - Green
Thurs. - Red
Fri. - White
Sat. - Yellow
So, if today was Thur. I would want a Red Twist Tie (not White - which is Friday, almost a week old). The colors go in alphabetical order and Mon. - Sat. It should be easy to remember, but if you can't you can print it off and carry it in your purse/wallet for a shopping reminder.