I work at Blockbuster.
On sundays we have the massive reprice/transfer/destroy pull. What I do when I reprice movies is take all the dvd's from the shelf and bring them up to the front. So in the middle of taking 60+ dvd's (my whole arm is filled up with dvd's to my neck, and about 6-8 dvd's in my other hand), this little

ing douchebag comes up, asks if we have a movie in stock, and asks me to show it to him, while I am strugging to keep the dvd's in my arms and not drop them all over the floor. Can't they just wait a few seconds after I drop my shit at the front?
A huge pet peeve of mine is people who put change on the counter, even if you have your hand in a cup-like position, something that suggests to people "put change here". And next thing you know, they drop 4 pennies, 5 dimes, 6 nickels, and 3 quarters on the counter, and having to pick each one up, one by one. I am ALWAYS tempted to put their change on the counter when I hand it back to them, but professionalism takes the best of me, and drop it in their hand.
As far as people mispronouncing movie titles, best I've come across is:
V for Vendetta - V for Velveeta
Oh, and a guess a good story to finish off with. It didn't happen to me, but my store manager, I was working with him at the time, and was ringing up people on another register, so I was able to get clips and pieces of what was going on.
So these customers drop off a few games in the drop box. They come in, pick out some movies to rent come to the front. The games were autosold to their account, so we had to check them in before they could rent. My SM looks in the dropbox, with no games to be found.
SM: Your games aren't in the drop box, could you have left them in your car or something?
C: Bullshit, I put them in there before I came in.
SM: Well, I'll look again. *checks the drop box, and also in the game cabinet in case someone missed it while checking things in*. I'm not finding anything
C: I just dropped them in there. Either you or someone who works here must have stole it.
Alright. NEVER suggest to the person that is doing their best to help you, to accuse them of stealing.
SM: *shocked, then takes the basket from the dropbox and shows it to the customer* There is nothing in here sir, and nobody here would attempt to steal something. There are even cameras all around.
C: *is really pissed and just stares at my SM*
SM: Could you have left it in your car or at home? The system literally won't let me rent to you as you have a ~70 balance on your account. Could you check and make sure? If you can't find it, call us back and we will work something out.
C: *throws movies down and storms out*
Customer shows up 10 minutes later, throws the games on the counter, and walks out. Didn't even apologize or say anything. WHAT THE
But probably the best part of my job is the ability to choose who I rent to.
Case in point, this kid cames in every week, the most annoying brat I've seen. He is ~14, if he doesn't get what he wants, he drops to the ground and literally screams and cries, until his mom gives in. There was this game that he was wanting to rent for the xbox, and he would call every hour to see if we had it in, a couple days a week.
We finally get the game back in, and who do I see come in the door?
He asks if we had it, I loudly proclaim that it has been autosold, and we won't be getting it back in. Even though it was just returned a few hours before. It was probably one of the highlights of my employment so far. It's an asshole move to do, but damn, it felt good.