crazy as a loon

Insane. Often used jocularly. Don't leave me alone with Uncle Stu, he's crazy as a loon!

Name	Pronounced	Usage
Guenevere	-	Arthurian Romance
Tarik	-	Turkish
Gilchrist	-	Scottish
Bridget	['bridʒit]
Lucienne	luy-SYEN	French
Oran	O-ran	Irish