NPR's On The Media ambushes the ambusher:

In the past few years, “The O'Reilly Factor” has adopted an old tradition from “60 Minutes”-era TV journalism: the ambush interview. We talk to John Cook, investigations editor for Gawker, who says that Bill O'Reilly uses the ambush to settle personal scores. Plus, OTM producer PJ Vogt describes shadowing Cook as he tried to ambush an ambusher.

Give it a listen.