Well, Glenn Beck didn't actually make this guy pass out, it's just funny to make jokes like that.  The REAL funny thing here is that these fellows are discussing the economy, and fainting is a perfect metaphor for:

1.)  The fall of our economy.
2.)  The way we feel when we look at our investements.
3.)  Fainting.

Our favorite part of the video is at :12, when the fainter whispers "I'm gonna pass out."  He tried to avoid passing out on air and had the presence of mind to warn Glenn Beck, probably hoping Glenn would say "Let's cut to a commercial."  When that didn't happen, this fellow makes a much more verbal and direct announcement for his future, and then our MOST favorite part of the video; "Gone."  At least he wasn't on O'Reilly, that guy would've kept peppering him with questions even after he fainted.  "CAN'T HANDLE THE HEAT CAN YOU?!"  Poor guy.  Good thing he's ok.

Thank you for being a hero David Buckner.