Pratchett uses "Shave and a haircut, no legs" instead of the standard "Shave and a haircut, two bits (or 2 pence as in Soul Music). Likely he has created a variation because barbers were surgeons and amputation of limbs was a very real possibility both in Discworld and in Roundworld ...
Sir!"—rounding on the traveler—"do you not think it criminal, to take advantage of a poor soul thus?" From DREAD EMPIRE by John Brunner (1971) OVERCOMING THE MYTH OF BARTER A man engaging in barter, paying his yearly newspaper subscription to the "Podunk Weekly Bugle" with various ...