jump the couch
v. To exhibit frenzied or aberrant behaviour that makes it appear as though one is completely out of control or even insane.
Other Forms
W. has jumped the couch. …

The former stateside National Guardsman who was sometimes M.I.A. jumped the shark by landing on that ''Mission Accomplished'' carrier. (With Tom Cruise cockiness.)

Then, as president, he jumped the couch by pedaling through the guns of August — the growing carnage and chaos in Iraq and Afghanistan.
—Maureen Dowd, “Bike-Deep In the Big Muddy,” The New York Times, August 27, 2005
Let's just put it this way: We're normal at Quick until deadline, then we all "jump the couch."
—“The Ten,” The Dallas Morning News, August 09, 2005
2005 (earliest)
A defining moment when you know someone has gone off the deep end. Inspired by Tom Cruise's recent behavior on Oprah.
—Melissa & Rebecca, “Jump the couch,” UrbanDictionary.com, July 08, 2005
This just-so phrase was inspired both by the famous verb phrase jump the shark and by Tom Cruise's infamous and eyebrow-raising couch-jumping antics on the May 23, 2005 "Oprah Winfrey" show.