Just one word: Telephones. :)

You know one of these days I'm going to use creating a huge list of all the times Moffat uses telephones (with a sub-section for other related communications devices such as dictaphones, television sets, radios, spacesuit headsets) as integral plot devices as an excuse to do a great big re-watch of Press Gang, Joking Apart, Chalk, Coupling, Jekyll, Sherlock and Doctor Who.

ETA: Just realised that I'll have to track down his episodes of Murder Most Horrid too, as at least one of them - if I remember right - uses audio recordings as a key plot point. ;)

(relevant icon is relevant)