Just to correct a couple of things in DoubleD's entry above, it was not 60,000+ fans cheering when Michael Irvin was lying on the turf. There were sparse cheers (audible on television, but by no means a roar.) This is not to excuse those cheers, merely to set the record straight.
A couple more infamous events in the history of the Vet: in 1993, Wendell Davis, receiver for the Chicago Bears, did the impossible by blowing out both of his knees on the same play on the Vet turf. In 2001, a preseason game between the Baltimore Ravens and the Philadelphia Eagles at the Vet was cancelled due to the unplayable condition of the field's newly-installed NeXturf.