1989, Robert McLiam Wilson, Ripley Bogle, Arcade Publishing, published 1998, →ISBN, page 192:
Deirdre was increasingly off her tree in the last sad days of our relationship. Her demands and quirks were ever more extravagant and dislocated.
1994, Tom Wells, The War Within: America's Battle Over Vietnam, iUniverse, published 2005, →ISBN, page 391:
"These guys were off their tree," David Hawk recalled. At one point, a VMC activist asked the Weathermen what they were really after. "To kill all rich people," Ayers replied.
2010, Anouchka Grose, Why Do Fools Fall in Love: A Realist's Guide to Romance, Tin House Books, published 2011, →ISBN, page 92:
But after her wedding he goes completely off his tree, runs off into the wilderness and starts ranting in verse and writing poems in the sand with a stick.