“My worst habit is...getting naked all the time haha...sorry.”
“Feeling sorry for yourself, and your present condition, is not only a waste of energy but the worst habit you could possibly have.”
“My worst habit is my fear & my destructive rationalizing.”
“Well, 'I'm sorry' is just a thing to say, you see. I'm trying not to be so apologetic and obsequious all the time. It's just such a habit ...”
“Worst that can happen is Hagrid’ll have to get rid of the skrewts. Sorry ... did I say worst? I meant best.”
“Haha, I can't hit you. If I did, I'd feel sorry for the person who'd have to clean up the mess of your splattered brain.”