You would think Taylor Swift would be looking over her shoulder by now.

TV talk show host Ellen DeGeneres loves to scare celebrities—especially Taylor. Ellen once scared Taylor while replaying a tape of the first time she scared Taylor.

Third time's a charm.

Ellen had a bunch of celebs sit down, one at a time, and say nice things about Ellen for a TV promo spot.

When it was Taylor's turn, Ellen struck again.

"Ellen makes me feel so happy, joyful . . . ," an unwitting Taylor started, but Ellen jumped at her from the side and screamed.

Taylor jumped, even losing a microphone that was attached to her.

"What are you doing?!" a flustered and slightly annoyed Taylor asked loudly. "Why do you do stuff like that all the time?!"

Ellen replied, "You forgot 'scared.' It was just one more adjective." Ellen taps Taylor's shoulder. "Keep going."

The promo, which also features Justin Bieber and former President Clinton, starts airing soon.