Did you catch the ecommerce tip on the Office last night?
Jim Halpert gave the office staff a quick update on business performance, mentioning that customers were using coupon codes online, but they were still having a problem differentiating between the letter 'O' and the number '0'. (Another tricky one is the number '1' and the lower-case letter 'l'.)
This is a common problem with coupon codes, especially ones that are a long string of random characters:
Customers will have more success with codes that are more intuitive (GAP20 for 20% off at the Gap, for example), but it's best to just come up with codes that can't be confused:
Who knew the writers of the Office were so ecommerce savvy?