We don't have to worry about how you solve it, but it's problem in mathematics and the answer will be--surprise, it's going to be oscillating back and forth and that'll come out of the wash.

我们没必要去担心这个方程该怎么解,但这个数学问题的答案将会是令人惊讶的,弹簧会来回振荡,问题就迎刃而解了

耶鲁公开课 - 基础物理课程节选

It's when it's dark, it's raining, you think oh I've got to go and walk outside with one baked bean can and that's... and then I'll maybe.. if I do it, then I'll sometimes think oh I won't wash it out.

BBC