Asshole-ish and Stupid Customers at your job

I work in a toy store. Sometimes i work at the customer service and oh my gosh! stupidest peopel come and try to return items for no apparent reasons. I always get the people who comes in and try to return an open game (PS2, Xbox and that such). During the End of the July Month, people like to return their pools they bought like a month ago. And it specifally state (even on the box) that they are not to return it to the store for refund, because they can't do that to begin with. And teh only way it could've been retured anyway would be that it was defective or damage already before it was opened. We got lots of water guns that seem superficially damage and defective, but to simple matter, all I have to do is run to the back, fill it with water, and shazamm (it works like new), and apparently the customer said it didn't work earlier.

Another dumb stories i have are people who come looking for the bathroom. I understand the people who don't know where it is because they're in the front of the store, but OOOOOOO!! those people who are right under the fracking restroom sign and say "Excuse me, Where might your bathroom be?" But as a employee, i have to act accordingly to all customers and point them toward the RR.

Now during the Christmas season, it's crazily busy and of course there's people who are trying to do the last of their shopping and suchs so you meet them at like Dec. 22-24, you get the worst of them. Eventually neear tthe end of the day, the machine that you slide your debit/credit card thru broke and I turned on the "Cash Only" light, yet more than half of the customers come and try to pay with debit/credit. And so it happened, I get this guy how only wants to pay with Debit, but I told him that the machine for it happens to be broken at the moment and I cannot accept credit or debit and only cash.

So he goes into a rampage, and says " I only want to use Debit Only!", "Why dont your machine work!" "I don't Have and cash with me! THat's why I want to use DEBIT!" And he starts yelling at me for not having a working machine. "I apologize for the incovenience" I said, but if you step into the next line, the register can accept your debit. So he complains and complains for about 1-2 mins and I call my manager to settle this. Eventually it ends with him going to the next register. (how he pissed me off)

Jam it back in, in the dark.