I found this wasp dragging a immobilized wolf spider across my garage floor. I assume the wasp paralyzed the spider, but it could have possibly found it already dead. The wasp was fairly fast in dragging the spider, with the wasp pulling back wards. It even would pull the spider up vertical surfaces.
It was not a cooperative photographic subject and I think it thought I was trying to take the spider away, because on a few occasions it dropped the spider and flew at me until I backed away.
I read up on this and it seems the wasp paralyzes the spider to lay her eggs in the spider. The spider regains consciousness and the wasps larvae eat the spider alive.