With reporting by Josh Horowitz

Years ago, "Me and Earl and the Dying Girl" actress Olivia Cooke went on a job that would be many a fan's dream come true: ride around on Harry Styles' back for the boarding school-themed One Direction Autumn Term Tour video. In case you haven't seen that one, here's a GIF summary of Cooke's day:

It was not, however, a dream come true for the actress, she told MTV News.

Piggyback rides are generally fun, so what gives? As she told us, getting a piggyback ride is not so enjoyable when you really, really, really have to go to the bathroom.

"I remember I held in a poo all day," she says of the frolicsome shoot. "I was really constipated so long that I just had a really, really bad bellyache for like half the day so I just wanted to go home so I could use my own toilet."

No, those would definitely seem to be less than ideal piggyback conditions, we agree.

Hear more from Cooke below.

"Me and Earl and the Dying Girl" hits theaters June 12.