Of course, the waiter was right. First, the customer tries his wine. When he is happy with it, the waiter gives him more wine. But Mr. Bean didn't know this, and he quickly put his hand across the glass.
'No, thank you,' he said. 'I don't drink wine when I'm driving.' The waiter looked at him strangely - and walked away. He didn't say, 'Why did you try the wine when you didn't want it, you stupid man!