What’s funny about being the “designated ugly fat friend?” Well everything when you’re Mae Whitman, who stars as the titular DUFF in the critically acclaimed teen comedy, which opened over the weekend.

The DUFF tells the story of Bianca (Whitman), who receives a rude awakening when she learns of her stature among her more popular friends. Of course, she’s not satisfied with toeing the line and enlists resident hottie, Wesley (The Flash’s Robbie Amell), to help her defy the rules of her high school hierarchy.

Robbie Amell Says Everybody Has Felt Like a 'DUFF'

Whitman and the rest of the cast, including Amell, Bella Thorne, and teen comedy alum Allison Janney, bring the laughs both on and off the big screen thanks to ETonline's exclusive blooper reel, which shows just how fun it was to be on set. (Not to mention how wonderful it must have been to stare Amell's pecs.)

And if you still haven’t seen the film -- which Amell says has “a very John Hughes feel to it” -- then let these bloopers convince you why you need to.

The DUFF is in theaters now.