Or how about "like snow aff a dyke" something that disappears very quickly (his family went like snaw aff a dyke) or "couldny run a minoj" somebody totally disorganised ( a "minoj" is a Scottish Christmas savings club (known as a "menage" in posher circles). Or "Never died a winter yet" a philosophical riposte to any depressing news. How about "anither clean shirt'll dae him" about someone who may be "awfy no weel" - a bit under the weather but a bit apocryphal like he won't live long enough for another one. "Gonny no dae that" - please stop doing that, "A fiddler's biddin" - a late invitation to some event where you weren't the first choice.