As the season 3 DVD hits stores Aug. 24, revisit some of the show’s biggest shockers
5. Three's a Crowd
Fearing they're missing out on the college experience, Olivia (Hilary Duff) hatches a plan with Dan (Penn Badgley) and Vanessa (Jessica Szohr) to have a threesome. One problem: after the deed is done, Dan develops feelings for Vanessa, creating a messy love triangle.