A man on a bike was stopped at the border by police. He carried a bag of sand. On perusing through however, the cop found nothing else in the bag and therefore let him go. This sequence carried on every day for three years.

一名騎著單車的男子在邊界被警察攔下來。他帶了一袋沙子，警察仔細檢查半天，卻找不到任何其他物品，只好放他過去。這個情況每天重演，一直持續了三年。

One day both men, the cop and the bike guy, met at a pub. "Tell me, man," said the cop, "I promise I will not tell anyone; but what were you smuggling all those years?"

有一天，這名警察碰巧在pub遇見騎單車的男子。警察問：「老兄，拜託透露一下，你這些年到底在走私什麼？我保證不說出去。」

"Bicycles," the man said.

男子回答：「腳踏車。」