Sounds like that slip is ripe for a Reasonable Agreement sticker.
Update: Abelard sez, " As a former employee of HD, I bear them no great love, but the slip Mark was asked to sign is spit out when you do a transaction that involves the 'Special Services' desk - i.e. either a special order, a delivery or a will call.
"In all three cases the customer agreement is assigned a unique number (in his case, #156326) and is printed on letter-sized paper with the particulars of the order (items, colors, delivery date, etc.). This sheet also has disclaimers, such as 'We deliver curbside only, we won't go into your house' and 'Yes, I truly do want a fire-engine-red bidet and I know I can't return it.'
"We used to get the customer to sign off on the 8.5 X 11 and we would keep a copy, but someone decided it would be easier or more efficient to do this at the checkout.
"If he didn't get a copy of the customer agreement, then his salesperson did a bad job (I sure hope he knows what he just paid for, too!)."