If you engage in conversation with them, their 'report' on your card will be "a person of good will." This means someone who does believe in God-- or a god-- who might be persuaded to the "truth." You can't count on sharing the gospel to produce any quick results, so probably the only thing you can do is 'plant a seed,' and hope there are others who also plant and water it. It takes time to undo all that brainwashing that truth only comes through the Watchtower Society and every other organization, and every government, is of Satan.
Nevertheless, one type of argument that gives them trouble is about the resurrection of Jesus Christ. If you ask them if a person is made up of body, soul, and spirit, they will probably agree. If you ask them if Jesus was resurrected, they will probably agree. But then if you ask them what 'part' among body, soul, and spirit was resurrected, they don't know how to answer (unless maybe there has been a new answer furnished by Watchtower). Ask if his body rose, and they will say no, that Jehovah dissolved it in gases. Ask if his soul rose, and they will say no, the soul is not divisible from the body. Ask if his spirit rose, and they say no, his spirit was only his breath. So, what DID rise, you ask. HE did, they answer. That sets up re-creation instead of resurrection, and all they can do is insist they are the same. So then ask about his bodily appearances, Thomas touching the nail holes in his hands, his eating food,... and they will have to get on the defensive or bow out of it.