Ben 10: Alien Force, Season 1

Gwen Tennyson:
Dad, we need to talk.

Frank Tennyson:
In your room? I'm honored! When was the last time you let me in here?

Gwen:
I've been keeping a big secret from you: Magic powers.

Frank Tennyson:
(sarcastically) So you're what, some kind of wizard in training? Come on, Gwen. There's no such thing.

Gwen:
But, there's more. You ready?

(Closes the drawer with her spellbooks in it, with a stream of bright pink glowing energy)

Frank Tennyson:
That's a big secret.

Gwen Tennyson:
I met Grandma Verdona today.

Frank Tennyson:
I was afraid this day might come, but you never showed any signs of having powers. Your mother and I thought we were in the clear.

Gwen Tennyson:
Magic runs in the family? I knew it!

Frank Tennyson:
Honey, there really is no such thing as magic. Your grandma's an alien.