here I got one...
take a hidden camera and you can either use a small camcorder that is concealed or better yet those pinhole cameras you can now get dirt cheap and you can wear that under your clothing. anyway get a camera that works and go into different corporate scum we hate like Wal-Mart and print off official copies of the credit card rules that say they can't ask for ID.
Then when they kick you to the curb you mention you made a nice little video you will be putting up on youtube and sending to corporate.
see the look on that assistant manager that got off on his power trip telling you he makes up the rules.
hahaha I got this idea this weekend when I was with a buddy getting new tires. he took his camcorder out of the car because he didn't trust keeping it in there while they had is car. the whole time he was fooling around with it. then as a joke when he was leaving he told them he was doing an undercover customer service report and they got super nervous. He said he made a video to send to corporate and it will be up on youtube too.
funniest day ever