maybe not my favorite lines, but i think these are worth mentioning :
" search him. then i will kill you . "
" i will show you where i've made my home whilst preparing to destroy gotham..... then i will break you . "
maybe its not the lines themselves, but just the overall feeling behind them, the way he says them. like he's so confident and sure that it's entirely inevitable and there's absolutely no way he won't do what he said he would . and he actually MEANS it, because he literally goes on and does it afterwards. it's like another way of saying "you're ****ed,buddy". lol