I'd think most people would agree the "Greatest Moment in WWF History" was Hulk slamming Andre, Wrestlemania III.
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really? even though the cage thing seems tame now, it was unheard of then, i would think it's agreed on by most fans of the 'sport' as that moment - even if the extreme becoming commonplace didnt happen until ecw.
going on top of that cage, particularly with a huge audience that night - heightened the audience's expectations of what these guys would do to entertain them. when i was real young, i was freaked out by seeing pics of dusty rhodes all bloodied up in the magazines, but that never made the major telecasts for some time.
you might even be able to say something similar about McGwire and Sosa's homer race that one year.
forgive the "raising the bar" expression, but it's pretty appropriate here.
as far as wrestling goes, Japan pros had been doing sick stuff for some time, but ECW put it in front of the rabid fans here in the northeast.