I feel certain that I am going mad again. I feel we cant go through another of those terrible times. And I shant recover this time. 1941, Virginia Woolf, suicide note:
(informal, intransitive, qualifier:typically followed by "and"; plus a second verb; typically followed by "and"; plus a second verb) To do something extravagant.
Let's go mad and have a bottle of wine with our lunch.
Here's fifty pounds in case you see anything nice to buy, but don't go mad.
(as a past participle and preceded by a noun, informal, intransitive, usually) To reach an excessive or ridiculous level.
Why should we ban controversial speakers from college grounds? Surely that's political correctness gone mad?