Nothing is as irritating as the fellow who chats pleasantly while he's overcharging you.
I do not say a proverb is amiss when aptly and reasonably applied, but to be forever discharging them, right or wrong, hit or miss, renders conversation insipid and vulgar.
I am charging you with the protection of my mother and friends, not to mention keeping my younger self off the Internet. He is as dangerous as Opal.