中文說－－let one's hair down 和 push one's buttons

在5月19日的報紙‘The Modesto Bee’上看到這麽一個句子：
When he really let his hair down, he really had a great sense of humor and when he was really determined he could really mash people's buttons.

句子裏的let one's hair down和mash one's buttons中文怎麽表達呢？

舊時婦女多數都留有長發。一般人們認為婦女在公共場合應保持端莊穩重的形象，因而如果她們要去參加較為正式的聚會時，就會認認真真地梳洗一番，將頭發做成各種精美的發式 wearing their long hair pinned up in a variety of styles 。隻有平時在家時才能將頭發隨意地散下來and taking it down only in the privacy of the bedroom。所以 let one's hair down 就用來表示‘不拘禮節、無拘無束’ to give free expression to one's private views; to behave informally。

Kings and queens can seldom let their hair down. 國王和女王難得有自由自在的時候。

Sally, we've been good friends for a long time. But lately I get the idea you are very much upset with me. I wish you'd let your hair down and tell me what's wrong to make you feel this way.
薩麗，我們多年來一直是好朋友，可最近我感到你對我非常不高興。我希望你能坦率地告訴我，到底是些什麽事使你這麽不高興。

而 mash someone's buttons 在字典裏根本查不到。請教了美國人，被告知一般他們用push sb's buttons，一般字典裏也沒有收錄。

折騰半天，在dict.cn上查到是－－使某人行動起來。好不容易又在The Free Dictionary網站searched 到：

to do exactly the right thing to get people to act the way you want.

－－He was an extremely good speaker and knew just how to push an audience's buttons to keep them interested.

Usage notes: also used in the form know what buttons to push:

－－People in your own family know exactly what buttons to push to upset you.

我請教了一美國朋友，他給了一個例子：
Oh, man. He really pushed my buttons ， which means He really made me mad or upset.

(補充：)一朋友從一本八卦雜誌上找到一個句子：Brazen beauty knows how to push Baldwin's buttons.（Baldwin是好萊塢的名人。）

push sb's buttons 中文該如何表達？