Rocksteady Studios' Arkham series really was absolutely miles ahead of its time, in basically every department.

The graphics created a version of Gotham that we'd never seen before, whilst the beat-em-up gameplay also left every other competitor in the dust. Launch issues with the PC version of Arkham Knight aside, it's still one of the most consistently excellent trilogies around.

Most players would agree that, amongst the three games, Arkham City probably serves as the zenith and players haven't spent thousands of hours exploring every nook and cranny to discover its secrets.

Over on YouTube, one of the rarer pieces of dialogue is blowing people's collective minds, but you'll have to do something quite counter-intuitive to get it to happen.

In the mission where Batman is inspecting a

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