tu quoque fallacy:
Me: "While Rutherford claimed to be God's personal spokesman, he was an adulterer."
Them: "You haven't lead a very exemplary life yourself, you know."
Slippery Slope:
"As soon as one leaves the protection of Jehovah's Organization, they fornicate and get addicted to drugs."
Argumentum ad Populum:
"Seven million people preaching Jehovah's Kingdom worldwide is sure evidence of God's blessing on his people."
Red Herring:
Me: "There is no evidence that Jesus began ruling the earth in 1914."
Them: "Yeah? Well prove that Jesus and God are the same person."
Appeal to Authority - A rgumentum ad Verecundiam
Me: "There is no basis for the indefinite article to be used in John 1:1."
Them: "Brother Franz was a recognized Bible scholar, an expert in Bible Greek and spoke 7 languages. You think you know more than him?"
Farkel