Matthew 24:29: "Immediately after the tribulation of those days the sun will be darkened, and moon will not give its light, and the stars will fall from heaven, and the powers of the heavens will be shaken."
Back when it was explained that the Great Tribulation began in 1914 and there was an interruption about 1919, finally culminating in the final part of the tribulation which was Armageddon (which was supposed to have happened years ago,) I thought I sort of understood this scripture. Then new light stated that the Great Tribulation didn't begin until Armageddon (a future date). Well GB member, Albert Schroeder, visited our house for dinner one night (not long after the new light started blinking) and I asked him what this scripture now meant. He explained the the tribulation was really the tribulation that occurred in 70 CE with the destruction of Jerusalem, but the rest of the scripture applied to the events of our day. I asked how this could be because it said "immediately." He explained that "immediately" could really be 1900+ years, quoting the scripture in Rev. 1:1 about the vision given to John being about events that would "shortly" take place.
I found it totally confusing but, like a good JW, I accepted it.