迅雷不及掩耳

Explanation: Thunder came very quickly, even have time to cover their ears. Ferocious metaphor, people time to prepare. 　　Usage: The main predicate; as attributive clause; metaphor ferocious, make time to prepare 　　Source: "Long Tao military potential Tragic Hero" Jilei less than their ears, fast power less than rest in peace. " 　　Examples: ~ So I gave him a surprise attack, one to eat him, is entirely possible. ★ Qu Bo "Linhaixueyuan" twenty-nine Thesaurus:  do stb.when people are off guard, take sb. unawares, to help a joint cause Wish watch, Surprise, The enemy is unprepared, Ji lei Less Their ears