Though they've encountered some difficult tasks, the teams on season 25 of The Amazing Race have mostly been getting through the early legs with very little drama-but that is all set to change when they arrive in Copenhagen.

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Front-runners Misti and Jim Raman, married dentists who have so far won two out of three legs and placed second in the other, believe they are the team to beat this time around and that they can truly dominate the race-but a series of mishaps could cost them the title of most dominant team on the October 17 episode.

"This is the worst feeling," Jim says in a preview clip for the episode, where the married couple appears to have trouble riding a bike through the streets of the city, and further encounters trouble during a roadblock task, where Misti appears to continually get the wrong answer to the puzzle she is supposed to solve.

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However, the two did win the coveted save in the first leg, so if misfortune does put them down at the back of the pack for the first time, they can still prevent themselves from elimination-though they may not need to worry about that being a possibility after mother/daughter team Shelley and Nici encounters problems of their own.

The two, who have been at the back of the pack for most of the race and managed to work their way up to the middle in the last leg, will have some major hurdles after they continually fight on the newest leg-and it appears the drama will become too intense for them, causing them to possibly quit.

"What are you doing?!? I can't do this!" Shelley exclaims in the clip, as she turns and walks away.

The Amazing Race airs Fridays at 8 p.m. on CBS.

Tags: The Amazing Race CBS Reality TV