I recently had my phone fixed at a uBreakiFix location and at and on the bottom of the credit card receipt it has a contract written at the bottom that among other things says your waving privacy rights, property rights to your old parts, swear you have read some link to a TOS. When checking out they never mentioned any of that when signing the receipt (with the exception of the not returning the parts when I told them I would like them back). In my option any contractual language should have to me signed for separately then a CC receipt.

EDIT: with that said they did a great job fixing my phone with an hour or two.