As a cart pusher for a grocery store:
1. Please don't tell me to not hit your car as I walk by to clean up the carts near where you're parked. I'm there to HELP prevent that kind of thing, not cause it. Yes, I know cars are expensive. However if you lazy slobs would put them away in the designated areas 10 FEET from your car instead of around it, in front of it, behind it, etc.. this wouldn't be a problem, would it? (I've done this crappy job for 5 years now, never once came close to hitting a vehicle with a cart).
2. Please don't push carts as hard as you can at the store to prevent crossing the street. They just bounce off the wall and half of the time end up in the middle of the road. I then have to stop what I'm doing and go collect them to prevent a traffic accident, because yes, people will drive right into a shopping cart going 5 MPH...
3. If I'm collecting carts in your area, I know you're there. I've seen you sitting in your car procrastinating leaving for the past 5 minutes, please don't immediately start your engine and start backing out the second you see me passing behind you with a train of 25+ carts, I know, you don't want me to block you but I won't. One of my main responsibilities is to give customers the right of way, even though I am a pedestrian.
4. Please don't 'hang out' in the parking lot, it looks bad.
5. Please don't ask me where things inside the store are, you probably know better than I do. I spend 99.9% of my days outside and don't have to even go through the store to clock in.
6. The earpiece in my ear is a headphone, not a microphone. No, I can't call a manager but I can go and personally get one, though it would be much better for you to just go inside yourself and talk to them there.
7. Yes we have a cart machine, if you see me pushing a train by hand its because another worker is using our only working one.
8. Please refrain from revving your engines in the parking lot, you're not impressing anyone revving your SUV.
9. Please don't park your vehicle on, at, or around the cart bays. That's where we put carts. Yes, you should even not park your motorcycle there... (we often have 3+ cars hovering around our cart bays, because they don't want to have to look for a parking spot and are waiting on a spouse to finish shopping). Also refrain from parking in the FIRE LANES please. It's my job to tell you to move your vehicle and its just as uncomfortable for me as it is for you.
10. Please actually let people cross the street and stop speeding down a pedestrian crossing. It really does NOT take that long to get through.
11. When you collect a cart inside the store, please don't pull so hard that 3+ come apart, when enough customers do this the entrance looks like shit. Also, when leaving its great that you are carrying your goods by hand and leaving the cart behind, but please push it into place instead of turning it around backwards and facing right into the other carts. I have to just go and put it on for you and it ends up wasting my time instead of saving it like you intended.
12. If I'm pushing a train of carts and I'm going to be coming in your way, drive that vehicle. Make your turn. Drive around me while you can. Don't hesitate and wait till the last minute and then almost drive right into me. Either learn to drive or have patience. It takes about 15 seconds for me to get the train out of your way.
13. I could go on all day but I'll stop here: FOR THE LOVE OF GOD, HAVE PATIENCE! I get paid shit to do an extremely exhausting job. I bake in the sun all day (103 yesterday, fun stuff!) and I'm here to clean up your messes. Next time you're going shopping you should say something nice to a cart pusher. We're hard working people and even our co-workers think bad of us. It's a simple job but it couldn't be harder work for the pay. It would be nice if people would look at me nicely instead of giving me a gaze like I'm some kind of pedophile.
edit: thought of one more D: please don't leave disgusting shit in carts. There are garbage cans everywhere.