Why a Chinese hotel guest was outraged after finding huge wad of cash under his pillow

A man in southwest China was surprised to find nearly 10,000 yuan (HK$12,000) under his pillow when he was about to leave the hotel room he stayed in overnight, according to a newspaper report.
But rather than being pleased he said he was outraged because it suggested nobody had made his bed properly after the previous guest had left, the Chongqing Evening News said.
Lu Gang, who was in Chongqing with his family, stayed at the Shangdu hotel on Saturday night, according to the article.
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When he got up the next morning, he did a brief check before leaving to see if he had left anything and found the notes under his pillow, the report said.
“What a large sum of money,” Lu was quoted as shouting as he called in his family members.
Police were called and hotel staff counted the notes, which turned out to be worth nearly 10,000 yuan. The money was later handed in to the police.
A manager at the hotel told the newspaper the money might have been left by the last guest who stayed in the room before Lu.