A big one for me: Brian & Ericka.
I loved their bold pre-race interviews with Brian & Ericka describing what "being in love is all about", but as each episode progressed, their frustrations and tempers began to unravel out of control for me . My breaking point came from their Detour biking mistake. I was so over them once the Cirque du Soleil bungee took its toll.
They were only racing for two episodes (the CBS premiere), but during TAR15 pre-race, I loved Garrett & Jessica. They seemed like the most down to earth dating couple that season next to Team Kazoo (Marcy & Ron). After they reached Vietnam, I really began disliking Garrett's attitudes since the Roadblock. He seems too controlling towards Jess, but maybe that's just me. Then, remember what happened during this scene...