Mexican cops have very itchy trigger fingers.

墨西哥警察的扳机手指非常痒。

Sorry. Itchy trigger finger. -Geez! What is with you?

-对不起。 触发手指发痒。-天哪！ 你怎么了？

Say it came from some underling with an itchy trigger finger.

就说是某个冲动的下属干的。