Dancin like a hen on a het girdle. Like a cat on hot bricks. Don't talk of rope to a man whose father was hung. Eenin orts is guid mornins' fother. What is despised today may be valued tomorrow.
Facts are chiels that winna ding.
Facts cannot be denied. Fell twa dugs wi the ae bane. Kill two birds with one stone. Give a beggar a bed and he'll pay you with a louse. Gie yer tung mair holidays nor yer heid.