Chris Matthews struck back at Glenn Beck on his Wednesday show, deriding his Fox News rival in two different segments and calling him "looney tunes" and the "#1 exploiter of fear."

Last week, Beck exploded at Matthews on his radio show, yelling for minutes about Matthews' denigration of Michele Bachmann.

In his first segment, Matthews brought on Salon's Joan Walsh and Mother Jones' David Corn to talk about Beck's latest theory: that the Egyptian uprising is a terrible thing and could lead to an Islamic caliphate across the Middle East and even into Europe.