Sherlock, Series 1

Sherlock:
Where are we?

Taxi Driver:
You know exactly where we are, you know every street in London.

Sherlock:
Roland-Kerr further education college. Why here?"

Taxi Driver:
It's open, the cleaners are in. Thing about being a cabbie, you always know a quiet spot for a murder. I'm surprised more of us don't branch out.

Sherlock:
And you just walk your victims in? How? [Taxi Driver pulls a gun on Sherlock] Oh, dull!