I swear that my JW friend told me that Matt. 27:51-54 wasn't really speaking of a resurrection, but that the bodies were tossed out of the graves by the quake and only "appeared" to be alive, ....etc.....( They were tumbling around and looked like they were walking, but they were really just dead bodies that fell out of their graves and were moving around because of the quake.)
Yes, I remember this well. This is one of the subjects on which the WTS quotes spiritist Johannes Greber for support. If no one gets to it before I get home tonight, I'll post the quote from the WT pubs.