We have this phrase in English to refer to people who are a bit clueless. I was wondering if something equally funny exists in Italian. Sample context: They put John in charge?! That guy can't find his butt with both hands! My attempt: L'hanno messo come capo John?! Ma quel tipo non sa un cazzo di niente! My Italian attempt is a lot more vulgar than the English though, and also doesn't give a funny mental image, like you get in English Any thoughts?