A 2-shot would be so great. Since you can ask her to do a pose.
Like Ultraman finishing move! Or if no one's looking, half-hearts each!!
or Choo Choo Train dance! Endless possibilities!
Now if it was:
1. Her singing Happy Birthday to you (the real one. And no, it doesn't have to be your birthday)
2. Her making food for you (I'm talking sprinkling M&M candy toppings to a prepared cake, taking 4 seconds) or
3. Have your favourite member slap you in the face
now that would be a hard choice.