I work at a Walmart, and here are my replies to this, and how they would pan out.
1. This is just funny; Do it.
2. Don't worry, we fix them daily. Everyone thinks they are the first person to think of this, and Alarm clocks are in Furniture. (At every Walmart, yes.)
3. This is just stupid. No one wants to clean up after you, and there's no way you can get away with that without getting banned from the store.
4. There are no code numbers. This would be funnier if you told them it was a code black. I'm not going to explain why

Do it.
5. There is no Layaway, not for the last 1.5 years. It's called Site-To-Stire now, and it has nothing to do with buying now, paying later.
6. Good luck finding a carpeted area aside from the entrances anymore. They are remodeling all of the Walmarts slowly starting about 5 years ago.
7. Again, good luck. This would take too much time, and no one would be able to pull it off, unless all the surrounding areas went to lunch at the same time. You could only do this in a small Walmart.
8. This is funny, do it.
9. The big bubbles aren't security cameras that are recording. If you go to the garden center, and look up at the small bubble near the registers, then it's funny, because it goes right to the store managers office.
10. Meh. This is average, but you can't handle the guns most of the time according to policy. You'd have to find an idiot to give you the gun, because they have to go through certifications to even work there.
11. Not very funny, but no one would really freak out. They would just call you a freak behind your back. Security will follow you, but you won't know it.
12. This is alright, I suppose.
13. Only good if your little.
14. You'll just get kicked out for this. That is unless the assistant store managers are pansies.
15. This is funny. Do it.
16. Meh, this would piss off the toys associate, but they would likely only kick you out of the department, and send security to follow you.