Phoebe Tonkin may portray a sassy and sexy werewolf on The Vampire Diaries, but she didn’t always have the ability to shed her skin in favor of fur and fangs.

Before landing her role on one of the best American shows on TV, the actress went down under (way under) for the Aussie fantasy-drama H20: Just Add Water.

Yep, before Phoebs was trying to pull one over on Klaus, she was putting on a mermaid tail and hopping in the water to film scenes at Sea World Australia!

On April 25, Phoebe shared a snap from her days on the set, tweeting. “Under the sea #tbt!”

While the actress undoubtedly looks great as a mermaid, we have to wonder why she looks so mad! And that’s where you to come in. Take to the comments below to caption this photo, and we’ll choose our winners in the upcoming days!