f(x)'s Sulli revealed her intense fear of birds on the latest episode of 'Amazing f(x)'.

On the June 18th show, the girls of f(x) continued crossing out items on their bucket list. They were at a lake when they came across some birds. Sulli, who was shaking, explained, "They're so scary and gross. And even when I'm with a lot of other people, they always come to me."

When they saw some ducks chilling on the lake, Sulli grabbed onto Victoria, yelling, "Unni. They're so gross!" The f(x) member was so taken aback that she ended up calling Amber "oppa." Sulli commented, "I was so shocked, I called Amber unni 'oppa' in that moment."

Victoria, Luna, and Krystal comforted Sulli, while Amber chased them away by running towards them.

Check out the episode below!