A common one is you hold a door open for someone and they walk straight through without acknowledging your existence. It's heaven-sent when there's another door just after and you can let it close in their faces! Fight ignorance with ignorance!!
I always try and say please or thank you. When ever I'm in a shop or bar etc I always say it. If the person doesn't say it back I say it again in a different tone. I done it yesterday in macdonalds carpark after paying and she plonked change in my hand. I told person at next window you have miserable staff and explained. She give me a drink and said pull in bay I'll bring it over. She brought it over and didn't say enjoy or etc. so I said to her there's another one. I don't know why I have posted this just a bed time story maybe. And then we all lived happily ever after.
I hate owners that glare at you when your playing the machine. earlier i sent my mate in for a fruit as the landlord just stares at me the whole time im there, I go in the pub next door (same fruit). Anyway get in there get a drink and get to work, Only to my suprise the owner of the pub next door is in having a drink, I can see him in the glass staring at me, I turn around and stare back. Must be a good 45seconds to a minute constant stare off, He looks away i win!!! Must have been gutted to get back to his pub only to see my mate taking his bandit for 2 jackpots. Hahahaha!!!