Pretty Little Liars, Season 5

Aria:
There is a very good chance that you might get called in there to testify.

Mike:
Bring it on. I'm ready to talk.

Aria:
No! No you're not, Mike. You have to keep what you know to yourself.

Mike:
I already made that mistake. If I had gone to the cops the night I saw the blood and told them what Mona was planning, she might still be here.

Aria:
Yeah, but if you bring up what Mona did, who she was helping, this could come back to bite you. It always does.