i wouldnt normally notice... until i was walking away from the store...
one time this stupid book store over charged me buy ten dollars.. and i didnt notice... and then the next time i went there.. they undercharged me by ten dollars (there cash register was probably high on electricity or somethin.. ) and then when he gave me the extra ten dollars.. i kinda stopped for a minute.. and glanced at it.. but he noticed my hesitation.. and he was like "hey WAIT A MINUTE! give that back!" .. and i started to say "no.. but.. last time..." .. and then i realized how stupid it would sound... so i gave him back his stupid ten
