Supermarket Confusion

Yesterday my friend and I went to the supermarket to buy some beer. We took a box and went to the till.
There was a young girl--pretty and nice, but when she saw us she blushed and suddenly began to speak quickly and said we had to go to another till.
But we didn't understand why!
The manager came and explained again that we had to pay at another till.
But this till was open!!
We said, "We have the money, we have the beer, we want to pay!"
She told us, "You may pay over there,"
We said, "We want to pay here!"
Finally, they explained that she was under 18 and she couldn't sell us alcohol.
What a crazy rule!
JAROSLAV THE WISE