I was working at Staples, minding my own business, when a customer approaches me holding a couple of HP cartridges...
SC: Thinks I care where he shops
Me: Your local RAM chip jockey
SC: Do you still have a recycling policy for ink cartridges?
Me: Yes, but it's changed. Instead of getting a $3 coupon, you now get the $3 back on your Staples Rewards card.
SC: I don't have a rewards card.
Me: Well, it's free to sign up-
SC: I have enough cards already.
He then proceeds to put back the cartridges and starts to walk out!
SC: I'll take my business to your competition instead!
After he'd left, the main cashier, who'd been watching the whole incident, remarked, "Well, he wasn't nice!" The other tech on duty, who'd been working on a computer when it happened, then said, "He was an asshole, even if he was
He wasn't overly nasty, just decided to make a bit of a show due to not getting his precious $3 coupon. 'Course, the inks he was buying were HP 02s, and (IIRC) our main competition in the area doesn't treat those the same as other cartridges you bring in for their recycle policy, so I'm fairly certain he didn't do any better over there.