LOL Loca! The girls here at the supermarket are like that - although it's easy to fluster them because our local paper rarely has coupons so they freak when I bring in a stack that I've traded for online (or worse yet - the kind you print out).
Now I just try to go shopping late at night when the only check out person there is this one guy who just doesnt care if the machine gets stupid - he just enters in the amount of the coupon, hits the cash in key & continues on.
