Out in the wild, when a shark flashes his teeth with a pearly smile, it's probably because he's about to attack.
Things may not be that different on the set of "Shark Tank." In a Reddit "Ask Me Anything" forum, "Shark Tank" judge and serial entrepreneur Robert Herjavec gave a glimpse into what goes on behind the scenes when the judges compete for and debate big business deals.
"We have a very powerful relationship with our own money so ya, it gets serious," he wrote. "Tension is very real."