In Ajax, after having been induced to madness and very publicly slaughtering livestock while under the impression they were his allies, Ajax is fairly subdued once he is in his right mind again and discovers everyone knows what he's done. This is a prelude to suicide.
De Guiche(trying to draw away thedismayedviscount): Come away, Viscount!
In Into the Woods, the Baker, after hearing some terrible news, goes into one of these, in song form. Literally, he sings a song about how he just wants to stop everything.
"No more feelings... Time to shut the door ... Just no more ..."
Miss Saigon: John, to Kim, about Chris. "He went crazy when he lost you, spoke to no one for a year. Then he finally said I'm home now, my life has to go on here." Of course, it didn't really go on—earlier in the play we see him waking from a bad dream and his wife's lyrics indicate that this is a nightly occurrence.