I've heard someone be paged at MK, too. Even the CMs looked surprised. They said that hardly ever happens.
I don't remember where I read it, but I did read a story one time about a woman who took her kids to WDW while waiting for a transplant. The organ that she needed became available while she was in the MK one day, and they put out an all points bulletin for her (guess they didn't have the PA system then) and found her almost right away so she could get to the airport. She did make it in time and the transplant was successful, though I don't remember what she had transplanted.