*or things screamed at me*
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Customer: Where are you 80's costumes?
Me: You're going to have to be more specific than that.
Customer: You know, like tye dye and stuff.
Me: That's really more of a 60's-70's thing, but our tye dye is in that corner over there.
Customer (suddenly very angry): Sweetie, I lived through the eightes, so I think I know. (Storms off)
She was probably just about my age.
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Customer: Do you sell KKK costumes?
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Customer: Do you sell kids' costumes?
(Note: Over half the store is kids costumes)
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Me: Hi, how are you today?
Customer: Just fine, and you?
Me: Good, thanks.
My Manager, who just happened to be standing there: Liar!
Me: He's right! I hate my job, I hate the public, my back hurts, and I'm hungry! Did you find everything you were looking for?
(Luckily, the customer thought it was funny).
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Customer: I want to exchange this, it doesn't fit.
Me: Okay, do you have your receipt?
Customer: Yes.
(Customer hands me receipt and a grocery bag with a costume in it)
Me: Ma'am, where's the package for this costume?
Customer: I threw it out, I didn't know it wouldn't fit.
Me: I can't take this back without the package, ma'am.
Customer: Well, why not?
Me: Because I'm not!
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A large, very angry woman walks up to my counter about five minutes before closing on a VERY busy day.
Customer: Do you have like, two people working?
Me: Pretty much, is there a problem?
Customer: We can't find anything, we can't get any help, no one knows where anything is, we can't use the dressing room. (because it's so close to closing, that's store policy)
Me: I'm sorry, we do the best we can.
Customer: I know, it's not your fault.
I ring up the customer's purchases and she proceeds to begin writing a check, which we don't accept because we're such a temporary establishment.
Me: I'm sorry ma'am, we don't accept checks.
Customer: WELL THAT'S IT! WE'RE NEVER COMING BACK HERE! WE'LL TAKE OUR BUSINESS SOMEWHERE ELSE! (storms out)
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Customer: Hi, I just told that girl over there (at the dressing room, it was our other assistant manger) that I have a '20% off one item' coupon but forgot it, and she said that you would ring it up anyway.
Me: Sure, no problem.
(She hands me a pair of boots and a costume)
Customer: Could you ring those up separately, so I could use the 20% off on both items?
Me: No, I can't do that.
Customer: Why not?
Me: Because it's off one item.
Customer: Right, so ring them separately.
Me: Ma'am, you don't even HAVE the coupon. I can't do that.
Customer: So you're going to make it so I don't buy everything today, have to drive all the way home, get the coupon, come back, and use it?
Me: Yes.
Customer: Is there a manager I could talk to?
Me: I am a manager.
Customer: So what if my husband came with me, and he bought something, and then I bought something right after him. You'd let us both use the coupon.
Me: No, I wouldn't. I'd take the coupon. You'd have to have two coupons to be able to use it twice.
Customer: Well, this is just ridiculous. You're sure you're going to make it so I don't buy all of this today?
Me: Yes!
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(Backstory: We had over 200 boxes of stock to put out one morning, and it was just me and another girl there until 2pm. Because there has to be someone in the dressing room area at all times when there are customers trying stuff on, I opted to keep the dressing rooms closed until more help came in, so we could focus on getting the stock out).
Customer: I'd like to try these two costumes on.
Me: I'm sorry, our dressing rooms are closed right now.
Customer: You're kidding.
Me: Sorry ma'am. They're closed right now. We only have two people here.
Customer: Well if I can't try these on, I just won't buy either of them!
Me: Okay.
(She storms off. I go back to stocking. 5 minutes later, she comes back to me).
Customer: I just want you to know that you're being a real bitch! What's your name, and the store number?
Me: My name is Erin, I'm an assistant manager, and here (gives her slip of paper) is the store number.
Customer: Is your manager in?
Me: Nope.
Customer: When will he be in?
Me: I can't give you his schedule, ma'am.
Customer: What?!? Then I want his phone number, or the district manager's phone number.
Me: There's no way I'm giving your their personal phone numbers.
Customer: I work in retail, and I know you can give those to me!
Me: No, I'm not giving you their phone numbers.
Customer: Well I'm going to talk to someone about you, and I hope to GOD you get fired!
Me: Okay.
Customer (on her way to the door): Fuck off!
Me: Well, I certainly hope we won't be seeing you in here again!
How I Feel: 
amused