I'm the stoker -- inclined to sassy humor -- I reply with "Shhhh - don't tell my secret!" Or, "Damn you! Now he's on to me!" Cgallagh is often too preoccupied with steering to bother replying. He lets me provide the witty banter.
To appease your sociopathic side, you might turn and snarl, "I'll have to kill her now!" Maybe that will cause more problems than it cures.
I hear "twice as easy or twice as hard?" often. My reply, "Twice as fun!"
Kill 'em with humor and niceness, that's my M.O.