Again, it's mostly WWE I've seen so I'd have to go for Orton/Foley at Backlash 2004. I believe it's the only time the fabled Bed O' Barbed Wire has made an appearance in WWE. Seeing Orton land back-first on the tacks was also pretty awesome (though probably not for him).
That deffinitely wasn't that violent...
Seemed pretty violent to me.....
Pretty
**** by WWE's standards anyway.