Kelly Ripa and Josh Groban are Set on Fire on ‘Regis on Kelly’ [VIDEO]

Warning: Fans of Josh Groban and Kelly Ripa may want to avert their eyes from the following clip.

"Science Bob" Pflugfelder visited 'Live With Regis and Kelly' Tuesday and helped Groban and Ripa conduct a series of experiments with fiery, explosive results.

After first blowing up film canisters with Alka Seltzer tablets, Science Bob then prepared to set the hosts' hands on fire with a mixture of soapy water and methane gas.

"Science Bob, are you a real scientist?" Ripa asked nervously.

But despite Ripa's jitters, the experiment went flawlessly, with each of the hosts' hands erupting in a momentary plume of flame.

Still, we bet Regis is glad he wasn't here for this segment. Check out the video below.

[Live With Regis and Kelly]