I usually understand if someone is on crutches or in a wheelchair, and won't get bent out of shape just because it's taking them a little longer to get their stuff together.
With that in mind, it reminds me of something that happened a while ago in the weeks leading up to Christmas.
I was doing my usual ad set scanning in housewares when a woman in a wheelchair who was struggling to get a box off the shelf asked me for help.
She wanted to double check the price (I hadn't actually changed the sign yet), so I walked the item (I don't remember exactly what it was) over to the scanner for her. When she decided that she wanted it, I offered to take it up to the cash registers for her and put her name on it, because the box was too bulky for her to carry on her lap and still maneuver the wheelchair around the store.
She thanked me about fifty times between checking the price, getting a different box (the box she managed to reach was kind of beat up), taking it up to the register for her, putting her name on it and letting her know which register it was near.
She didn't ask me to take it up for her, I took it up because it was the right thing to do to help her get the rest of her shopping done without the bulky box in her lap.
--Son Of Thrognar