Cleaning public bathrooms. Hands down number one on the list. Seriously people, teach your kids to aim.
"Do you have X that they sell at Target?" No, no I don't. They apparently have it at Target though, which is right across the street. Have you checked there? There are a few exceptions, and even a few things that I not only have, but I have for cheaper than Target. Every time somebody has asked me this though they're looking for cheap Chinese made stuff. Trust me on this, there ain't no way in hell I can compete price wise with Target and Walmart when it comes to low end Chinese made stuff. They have that shit locked down.
People browsing for an hour while letting their kids run wild. Really? Don't tell me you can't hear the kid raising a ruckus. This is a retail store not a playground, daycare, or activity center. I expect them to act like a kid in a toy store, but let's keep something of a lid on it, shall we?
"Where's the girl section?" Art supplies and craft kits are in that corner, baby and toddler toys are in that corner, this side of this aisle is board games in the front and puzzles in the back. On the other side of the aisle is active play/outdoor in the front door, building toys in the middle, and planes/trains/automobiles in the back. The next aisle is all science kits and novelty toys. In the back is pretend play and dress up. "So... where's the girls section?" FML.
"I'm looking for a gift for an X year old boy/girl?" What are they into? "I don't know, they're X years old though." In that case buy that thing because every single 5 year old boy is playing with it. *head shake*
People looking for donations for family members of people who died without life insurance, schools, churches, local non profits, or local unions. Look, I'm not heartless, but I get hit up at least weekly. I can't afford to give you all something.
That's all I can think of for now. Cleaning bathrooms really does blow.