Gravity Falls, Season 2

Ford:
Dipper, can I tell you something?

[Dipper nods]

Ford:
You asked me earlier what I was working on. Well, (pulls a curtain down to reveal the portal is gone) I dismantled the portal. An interdimensional gateway is too dangerous for the world it feeds into. That's why I was mad at Stan for using it. He saved me but, as I feared, the instability of the machine created this: (holds up a transparent sphere with a blob in it) an interdimensional rift. I've contained it for now, but it's incredibly dangerous. Dipper, I don't want you to tell anyone about this. Not Stan, not even your sister. You understand?

Dipper:
Oh-uh, of course.

Ford:
In my time I've made many powerful enemies, but I trust you with this secret. Now get yourself to bed. I have much research to do.

Dipper:
Goodnight, Great Uncle Ford.

Ford:
Goodnight, Dipper.