Dowd: Bush has "jumped the couch"

Brilliant:

W. has jumped the couch.

Not fallen off the couch, as he did when he choked on that pretzel.

Jumped it.

According to UrbanDictionary.com, "jump the couch" has now become slang for "a defining moment when you know someone has gone off the deep end. Inspired by Tom Cruise's recent behavior on 'Oprah.' Also see 'jump the shark.' "