entirely inappropriate for a children's book but if you read the wiki article on Aberforth it gives loads of other examples which I hadn't noticed.
"when Harry and Hermione host the meeting of students interested in forming "Dumbledore's Army" at the Hog's Head, the bartender is seen shooing a goat and looking slightly embarrassed"
"Hints of the connection between Aberforth and the bartender appear in Harry Potter and the Order of the Phoenix, when Harry noted a "strong odour of goats" in the Hog's Head pub"
and
" Dumbledore tells Harry, Ron, Hermione and Hagrid that Aberforth was not bothered by embarrassing news headlines regarding his having been prosecuted for practicing inappropriate charms on a goat, but instead "held his head high," and lived his life as normal ? "of course," says Albus, "I'm not entirely sure he can read, so that may not have been bravery..."
ok a bit obsessed with the goat thing, but I find it hilarious as so unexpected.