Other than a lot of shoppers, why have you had to wait in line?

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Ok - other than just being in line at a store, what has been any other reason for a long wait? The other day, I was in line to check out, and must have had to wait nearly 30 minutes, and still not be waited on. The lady in front of me either had a bunch of returns, or had purchased some things and something didn't have a price on it, or whatever. Finally, the lady asked if their was any way that she could allow me to go ahead and go through while the cashier was doing whatever it was she had to do to get things finished up, so the rest of us could go through as well. I didn't realize that I was in the "exchange / refund" lane, until I got right up to the register area. If I had been the cashier, I would have closed off my aisle, and that would have helped to detour myself and the other folks behind me, to another register where we could have gone through quicker. I think that this and all other stores should have a 'customer area, in the back of the store where all of this stuff is taken care of. And too, I'd like to see all stores have a 'cash only' line for those of us that only have a few things and are paying by cash. What do you think about this, and doesn't it frustrate you to go through things like this?