Solve my mystery

I was bored, so I decided to write a mystery.

  Two young children were waiting with their babysitter for their parents to come home from a business dinner. They were watching Elmo on TV. The babysitter told them it was time for them to go to bed. The children did not want to go to bed, so they decided to play a prank on their babysitter. They would sneak down and turn on the TV when the babysitter wasn't looking, but the babysitter caught them. All of a sudden, the TV turned on. The babbysitter and the children were upstairs, and the parents were out. Their doors and windows were locked. How did the tv turn on? Solve this in the comment section.

XXOO,

Eve