Kat: *sing song voice* biiiiill!

Bill: what!?

Kat: go in my head!

Bill: no!

Kat: you have to!

Bill: why!?

Kat: dare!

Bill: *grumble* fine *goes in Kat's head*

Kat: that feels weird

Dipper: yep

In Kats head:

Bill: this place is creepy *almost steps on a knife* seriously why? *wanders in to the fandom section* ... why?