As the Princess (Watson) so rightly says of our big-eared, titular hero, "You are a strange little mouse." He is indeed. And the film is a curiosity as well.
Let's break down that title first. Angus is the surly cat belonging to Georgia Nicolson (Groome), a 14-year old girl in Eastbourne who's recently discovered boys.
It's some 50 years since Ross Bagdasarian heard — we assume — a record played at the wrong speed and imagined that what he heard was singing chipmunks. Hmm.