毒品是老虎尾巴，说话不算话也可以是老虎尾巴。乔治•布什在竞选美国总统成功以后就有这样的教训。他1988年竞选的时候许诺说，当选后绝不增加征收联邦税。但是他登上总统宝座之后怎么样了呢？

He found he had a tiger by the tail. Despite his promise he had to raise taxes to cope with the deficit. And this helped Bill Clinton beat him in his try for re-election in 1992.

布什打破自己的许诺，增加征税，结果最终在连任竞选中被克林顿击败。

也许老虎尾巴还是不抓为好。