The move to have the proponent define the "thing" is a good debating tool.
Ask whether " all the things" Jesus predicted would include Armageddon, and have them prove it, then
Ask the jw to define the length of the overlapping anointed generation from 1914 to----? Make him/her commit to the wt charts, ends with rapture, at the beginning of the Great Tribulation, then ask: " so the generation passes, ends at that point? . Then have them read Mat 24:34. "-- generation will not pass.
added, after the previous, while I was writing seconds ahead, post by p.a. shows: The generation ends at the beginning of the Great tribulation, it, and Armageddon happens after the anointed are gone.
The wt overlapping anointed generation is not what it seems to be. scripturally true, but the talking snake is.