The Vampire Diaries, Season 1

Elena:
Hey! You...can't be back here.

Damon:
We need to talk.

Elena:
Does it have to be right now?

Damon:
Normally I would have a completely different outlook on what I'm about to tell you, but since it could really inconvenience me, I'll...squeal.

Elena:
What are you talking about?

Damon:
Stefan's still drinking human blood.

Elena:
...What?

Damon:
Yeah. (shrugs) A month ago, I would've rejoiced. But with the council back on the alert, it is not a good time for Stefan to fly off the handle.

Elena:
I know he's been a little edgy, but, he said that was normal...

Damon:
He has a fridge, full of stolen blood bank contraband, in the house.

Elena:
Oh my God...

Damon:
He has no idea what normal is - his entire existence isn't normal. Normal to a vampire is drinking human blood, but he's spent all this time fighting it, when he should have been learning how to control it. And now it's controlling him, instead.