I've called Arthur many things since I became his manservant (and before that, even), and he's probably insulted me just as many – if not more – times.
It's fun, to be honest. Especially when I can shock him into pulling that face that sort of reminds me of a surprised sheep.
Not that I've ever seen a surprised sheep – can a sheep even look surprised? – but Arthur's face after I've insulted him does look rather lamb-like.
Today was no exception, and I do believe it was the best sheep-face I've ever gotten out of him.
Clotpole. My ingenuity knows no bounds.