No matter what happens in the ring on Dec. 19, Jake Paul has got some massive balls to take on Anthony Joshua ... so says comedian Bryan Callen, who tells TMZ Sports El Gallo is "borderline crazy!"
We spoke with the comedian at LAX ... and talked all about Paul and Joshua's showdown at Kaseya Center in Miami, Florida.
Sure, many see Joshua, an Olympic gold medalist and two-time boxing champion, winning by a landslide .