The Eels handed South Sydney their first loss in almost two months on Friday night, with Mitchell Moses and Dylan Brown orchestrating a comprehensive 36-16 win over the ladder-leaders.
Parramatta showed their intent with a Sean Russell try two minutes into the game and took a 12-10 lead into the break, before overcoming South Sydney with four second-half tries.
Moses set up four of his side's six tries, while halves partner Brown terrorised the Rabbitohs with his running game, chewing through 139 metres and scoring a try on his way to winning the inaugural Eric Simms Medal as player of the match.