For me it's Rev 20:12 "and scrolls were opened".
Millions of JW's read this verse, then read the WT which says "These NEW scrolls..." so millions of JW's think the Bible says 'new' scrolls.
How can you read something so obviously simple, then instantly misunderstand it?
The context, the words, the meaning. It's so simple, yet they just can't see it. Blind, totally blind.
Also,
Jesus without a beard was nuts.
Pictures of a snake with legs (in Eden) was nuts.
Women being turned into men in the new system was barmy (g30 4/2 p.446)
The 8 flip-flops as to Mt 24:14 already being fulfilled is insane.
The 37 different interpretations of who the false apostles are (2Cor 11:13) is mind blowing.
That bobbed hair leads to baldness - g24 11/19 p.100.
That babies pacifiers (dummies) give them tonsilitis, and ultra violet rays are healing.
The 10 different definitions of the F&DS.
Then there was when they said that spirit mediums grew tentacles, and spirits lived among us wearing tweed and drinking whisky but were not able to bleed ("Talking with the Dead" p. 116-126).
Oh yeah, just remembered "overlapping generations"!
When will the madness end?