Narrowing her eyes, Korra focused her energy as best she could. The waterbending instructor had been clear on how her body should be positioned and flow. Easily, Korra got the water to go where her hands directed.
"Ha! This is easy," she remarked.
Korra's foot slipped on the ice. As her leg fell she watched in absolute shock.
A chunk of the earth below went flying.
Students, and the instructor were all silent.
All eyes were on Korra.

She had just earth bended.

No! I'm a waterbender, Korra looked at everyone around her with wide eyes. For the longest of moments nobody spoke.
"Well," Korra began as she pushed herself up. "We all know what this means right?"
Still no body spoke.
"I'm the Avatar you idiots!"