猜谜语:什么东西出去的时候是满的,回来时是空的?

我先答两个：

1.上班午餐饭盒；

2.家里的垃圾桶;

3. Car's gas tank ---- When you drive out from gas station, it's full; when you come back again, it's empty.

(big-guy原创)

[葳蕤]

钱包。:)

[福田]

3.Big-guy 手指间的雪茄，被点燃后。