I encourage you to introduce your friend to the historical foundation of JWs, especially Russel and Rutherford. Any casual browsing on JW sites will open the doors to this info.
You will find that: Russel the founder of the group now known as JWs derived his end time dates from Egyptian pyramids; his seven volumes Studies in the Scriptures featured an embossed Egyptian motif on the cover.
Rutherford was a classic cult leader who had a luxury compound built for an expected resurrection of Biblical characters in San Diego (though he lived there himself) and enjoyed travelling by private limosine.
Both would be denouced "apostates" by JWs if they were alive today.
JWs have whitewashed this history in their own publications and the current organization has streamlined away from its embarrassing past. Be prepared to back up your facts with proof. But don't fail to ask these questions: Do JWs believe that these men had the truth? (Yes, Russel established 1914 as a pivitol date; Rutherford introduced the "great crowd" group with an earthly hope, isolating 144,000 for heaven only.) And Does the truth change?
No matter what JWs build up as their organization, the entire foundation of their religion is pure crackpot and cult.
"Be on the watch for the false prophets that come to YOU in sheep?s covering, but inside they are ravenous wolves. 16
By their fruits YOU will recognize them. Never do people gather grapes from thorns or figs from thistles, do they?
17 Likewise every good tree produces fine fruit, but every rotten tree produces worthless fruit;
18 a good tree cannot bear worthless fruit,
neither can a rotten tree produce fine fruit. -Mat 7:15-18