Kotowaza of the day: Just don't touch the mouldings

Japanese:

羽目を外す

Romanized:

Hame-wo hazusu

Meaning of Japanese:

(lit.) to get carried away and remove the wall paneling*

English equivalents:

Cut loose
Let one's hair down
Lose control
Have a wild time
(... often in an excessive manner)

*羽目板 (hameita) is paneling or wainscot. How removing this came to represent reckless abandon is unclear to me, although 羽目 (hame) by itself has come to mean "a fix" or a difficult situation. Another etymological theory assumes that hame evolved from hami (馬銜), a horse's bit. A horse unrestrained by its bit provides a vivid illustration indeed of "wild time."