God of Carnage

Two boys get into a fight. Their parents meet, and over the night eventually act like children.

Relevant tropes:
 * Amoral Attorney
 * Cutting the Electronic Leash - The lawyer's wife finally throws his phone into a vase of water.
 * In Vino Veritas
 * It Got Worse - The entire play
 * Villainous BSOD - Happens to lawyer immediately after his wife disposes of his phone.
 * Vomit Indiscretion Shot - A character vomits onstage.