The only "pranks" I've seen are on one of the coupon blogs I read, and they have been extremely dumb. I'm quickly losing any respect I had for the blogger because of it.
They're doing building work on the other listed (historic) building that forms part of our residence. We got a joke press release that they had found viking remains. It was clear that it was a joke and was really funny the way they worded it. I was a fan.