Janelle Pierzina Makes 'Big Brother's Rachel Reilly Cry in 'Snake in the Grass' Teaser (Exclusive)

In ET's exclusive clip of 'Snake in the Grass,' Janelle Pierzina causes fellow 'Big Brother' alum Rachel Reilly to tear up after calling her out for making mistakes in the challenge. 'Snake in the Grass' airs Mondays at 11 p.m. ET/PT on USA.