Personally, I think that a lot of things in TAR18 are epic:
- the TBC legs
- the kangaroo race to the pit-stop
- Jaime & Cara's accident
- Jaime & Cara being able to pass Mel & Mike because of hypothermia
- Kent & Vyxsin missing their flight
- Jade Dragon Mountain and the zodiac roadblock
- double u-turn and dinosaur roadblock leading to Jaime & Cara's elimintation
- tea roadblock leading to Margie & Luke's elimination
- the whole Varanasi leg was quite epic
- Jet & Cord taking a late flight twice
- bike roadblock leading to Jet & Cord elimination
- the Matterhorn Detour
- the colourful Rio leg
Also, Gary & Mallory being able to win three legs, and to have the highest average of the season (which is the lowest highest average in a season in TAR US, which adds to the epicness 'cause each and every team (except the winners, who did not win any legs - except the last of course) were on the edge of elimination)