Depends on what you mean, if i try to kill a conversation that involves me and someone else, silence, rudeness, or digusting actions, killing a friends conversation with say a member of the opposite sex, male - hey dude i just heard your gf pregnant congrats, or so how go the genital warts, female- a varation on the second one i just said or, hey dave just called and said he has "insert std here" you might want to get yourself checked.