Authority figures always attract trouble

There are those who'll turn innocent occasions to their advantage.

Constant vigilance!

Someone creeping into his yard in the dead of night? More likely there's a very shell-shocked cat wandering somewhere, covered in potato peelings.

And do I look like the kind of man that can be intimidated?" barked Uncle Vernon.
"Well..." said Moody, pushing back his bowler hat to reveal his sinisterly revolving eye. Uncle Vernon lept backward in horror and collided painfully with a luggage trolley. "Yes, I'd have to say you do, Dursley.

Nothing like a nighttime stroll to give you ideas.