Cantillate

Jack had bargained hard for the bottle of Regalian Brandy and was looking forward to enjoying it. Unfortunately, the tales of its legendary status had skipped the part about it encouraging the drinker to sing. Quite badly, as it turned out.

After nearly getting throttled before he'd the chance to knock any bottles of beer off the wall, he challenged the Doctor and Rose to come up with something better and discovered that they did a surprising duet of increasingly bawdy rugby songs.

As cultural benchmarks went, it was a more colourful look at the 21st century than he'd expected.