go mad

Verb

 * 1)  To become insane.
 * 2)  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.
 * 1)  To reach an excessive or ridiculous level.
 * Why should we ban controversial speakers from college grounds? Surely that's political correctness gone mad?